70 Corvette Door replacement
How bad is the damage to your current door?
70-75 convertible doors are interchangeable, they all have the recess for the chrome alignment pins. Obviously the convertible door glass is shaped differently than the coupe glass. and the outer wipes used on convertibles are also different than those used on coupe doors. 73-75 convertible doors will have the side impact beams inside them, and while it won't hurt anything to have them in your door they do make the door somewhat heavier. You can identify 73-75 doors by looking for the end of the beam at the latch end of the door, where the inner frame meets the outer skin. On doors with the beam there will be a raised area about half way up the frame in the area where the weatherstrip is, while on doors without the beams are uniform in appearance along the whole edge where the frame meets the skin. The upper and lower door hinges are the same from 68-82, but all four hinges are different so make sure you have a left hand upper and lower.70-75 convertible doors can be hard to find and more expensive than coupe doors because there were fewer convertibles so convertible doors are more in demand. As has been said above, coupe doors or more accurately 69-77 coupe doors, can be modified for use on a convertible by adding the recess, the alignment pin, convertible glass and convertible outer wipes. 68 doors are one year only and use a different skin, door release mechanism, outside button/lock and outside door handle. 78-82 doors have a different inner structure to accommodate the 78-82 "hockey stick" arm rest and completely different inside lock, door release and latch mechanism.
Two things to watch out for on used doors is rust and the condition of the bottom corners of the door's outer skin. The bottom of the steel inner frame of the doors can rust out, especially on old doors that have been sitting outside or ones with bad or missing outer wipes. The bottom corners of the skin are often broken and worn off on doors that have been stored standing up on the corners, and while it came be fixed, it should still be checked and figured into the price.
The Best of Corvette for Corvette Enthusiasts

Look closely and you can spot the side impact beam in this 73. It lies just under the skin and next to the weatherstrip. Whether that makes a difference for a pre-73...I don't know.
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