How do I open the side-marking light to change the bulbs?

The sockets should twist out from the inside of the fender. Usually a 90 degree counter clockwise turn.

I am not familar with the 72.  But somebody here is!!  Do you have screwas holding the lens to the body??  Do you have openings on the ends of the lens to put the blade of a screwdriver in there??

______________
          



(click to see a larger image)

Should just twist out. Here's a view of a 72 side marker from the back:

They are a pain to get to, though!

______________
"Down on the Boardwalk...

(Click image to see a larger version}

Well did ya get to the bulb yet..you have to remove the front grill to get to the socket then do the twist thing..I think they are 97 bulbs..find them anywhere ..buy the long life bulbs as they are more work than they should be to change again..
Rich

______________

My first parade at Carlisle 2010