thebigredrocker
SILVER Star
I only know of three. 9/73-12/78 is one with the door hinge on the bottom. 1/79 the hinge moved to the right side. Not sure of the date but pretty sure the hinge moved to the left side with in a year or two after the 1/79 started.
You should be aware that in 73 the tank got smaller and 74 was the first year the tank cover was used. This will not fit a 66 gas tank without doing some mods to widen the cover. A 73-78 gas tank can be made to fit and use a cover but would loose a couple of gallons of capacity.