I'm looking at a couple of windows (driver and passenger side) on e-bay.  The seller says they have a code of M74.

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I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

Another try...

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I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

I cant answer your questions but I am sure that Joel and others will get you an answer  soon. I will be watching this thread as I would like to find some windows for mine as well.
Good Luck,
Rodney


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When you get the answer email vettsteve@aol.com he has been collecting part for vetts for over 20 years.

Sorry fellers....I been sickerndog....
The "M74" is NOT the glass date....it simply designates the use of the glass as a Corvette side glass.

Windows are dated as such...
Soft-Ray   Flo-Lite
Safety
AS2           DATE CODE
   Solid Tempered
DOT 15 M74(This designates Corvette Side window)

The date code will be 2 letters...the first designating the Month, the second designating the year.

Example: JL =May '74
The months codes are:
N= January
X
L
G
J
I
U
T
A
Y
C
V= December

Year codes are:
Y= '72
U= '73
L= '74

(LATE production '74s had side glass without the "Astro Ventilation" script, starting in June/July of '74. Earlier cars/glass will have the "Astro Ventilation" script)

See if he can get you the right letters to de-code the glass before buying. You could look at the glass on your car now and find the appropriate date to look for, but I would guess you would want an XL or LL for a March-built car.
hth


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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Now that I know what to look for, I just checked mine and found "NL"

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I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

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(click to see a larger image)

A January date would be correct/"acceptable" for a March built car. My '74 is a June 27 build with all May dated windows...windershield, side, and back. It also has the side glass with no "Astro Ventilation" script. Does your March car have "Astro Ventilation" on the side winders?


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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Yes, I have Astro markings.  The e-bay listing also says the windows also say Astro.

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I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

Oops.  I just checked the listing again, and it does not specify "Astro."  I think I must have assumed that.  And when I look at the pix, I don't think I see the marking.

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I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

$30 for side glass IS dirt cheap. Worth having if for no reason other than to have a spare in case one gets damaged.
NCRS Judging Guide states that the LATE production '74's used glass(non-Astro) made for the '75 year model, but it says that they had only "observed" it on Sept/Oct built cars. Mine sat on the assy line during a strike until Sept, so....draw yer own conclusions.


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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Just got the reply from the seller.  The code on the windows is YJ, meaning they were manufactured in October of 78 - not exactly correct for a 74.

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I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

YA..it's a fiar deal fer sher. They'll work fine up to '80, I think. The '81-'82 cars had thinner glass, if I remembers kerectly.

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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Would they fit a 72 convertible?

Just thought Id ask as mine drivers window has a chip in it.
Rodney


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They should. I'm fairly certain the glass is the same from '70-'80. The '68-9 cars may be different...not really sure on that. AFAIK, there were no changes to the side glass from '70-'80.

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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"