Maybe Custom AutoSound has them. I bought one for wife's Z/28. Looks original but has modern internals.
I think 64 was the first year that they were offered; (FM mono, not stereo) and it definitely won't fit easily in a 62 dash. The nearest one that has a flat fascia is in 1968. And then you've got size issues as the hole in the 62 may not be physically large enough to accept the receiver. You're better off going with a modern retro-look unit or finding a converter at a swap meet.
Les' Buick has the factory Sonimatic AM that functions well, so an aftermarket FM converter would work. It would be cool to mount it under the dash, but 'where?' would be the question. Factory tissue dispenser.
He can send it in and have FM and digital added do it still looks original. Jim from AZ on this site does the conversions as well as some others here.
Hey Les. I have a real nice fm convertor from back in the day. Not one of the cheapies that k-mart sold. Made by automatic radio. Can send pics to email if requested. John
Les, here is the ad. I located and copied: "This I acquired for my 65 Skylark but plans changed and I don't need it. Not a Buick part however the station pointer looks just like the 65 Skylark pointer. Just tested and working. Set your am radio about 900 and switch the unit on for fm stations. Dimensions 6 3/4 wide x 4 3/4 deep x 2 1/2 tall. Made by Automatic radio in Boston and Toronto. Buyer will have to fabricate a mounting bracket. Need 30$ plus shipping." John Attached Files: a"> SAM_1326.jpg File size: 57.7 KB Views: 135 SAM_1327.jpg File size: 48.7 KB Views: 95