Strap? mine is a flat metal strip, curved, that right now has a nail in the end that fits over the flange coming out of the A coulmn and a chunk of rubber on the end that fits thru the hole in the door.
To my knowledge, coupes don't have door check straps but they do have a short metal arm with a rubber bumper (B-702828) on it. However, I believe open cars such as roadsters and phaetons do.