Don't do it. My 79 came with one and it's a pain to put on/take off. 8 screws, 6 of which you need a screwdriver for. Can take 10 minutes to install/remove and is a little clumsy. Plus there's no effective tint. The sun just comes right through and broils you and the interior.
Worse yet for me, the stock top didn't come with the car. I'd much rather have/use those, even if they're body color instead of the glass ones. I looked on ebay for replacements, but none was available. Mid America wants over 1K for glass 2 piece replacements, and I might break down and get them someday.
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Whoever dies with Jesus in his heart wins.
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1979 L-82, close-ratio 4 spd, 3:70 gears
Rebuilt to 300 HP
Holley double-pumper, Edelbrock intake, headers
Upgraded suspension, American Racing S200 wheels