I just bought replacement Corvette America sunvisors for my '79. Apparently they changed the style of the sunvisor during the 1979 production year so there is a difference between early and late production '79s. I thought mine was an early '79 since I don't see any evidence of the visors being "telescoping", so I ordered the visors accordingly. However, they don't fit. Everything is fine except the size of the visor support rod is too small for the hole in the new visors. Do I have a late '79 or did I get faulty visors?