Try
http://www.retracmirrors.com/Product...duct_line.html for some that are just like the lower right ones in aerotruck63's pictures above, on page 29. I believe they are the original supplier to Chevrolet back then and are still in business. If you go to their pdf catalog on page 31, item 611706(21601) and 611708(21601), you will find them. I called them the other day, and they gave me a few local places to call to see about ordering them, since they do not sell direct to consumers. I called two places, and they were about $20 different from one place to the other, so make sure you call around. The less expensive place was about $70 each, but they had to order them. I have to wait awhile before I can get them, though. I had to pass on the ones in the classified section, bummed.