For what it's worth, my 64 neck is nearly identical in size and feel, to my CS 63 Strat. I already had the Strat, and when I got the Tele, I just figured this must be an average early-mid 60s 'oval C'. The 58 doesn't have a C neck. They call it a D. I call it a skinnier U. It's a bit strange, like nothing else. I suspect that's partly why they are the least popular of the three. That, and 'everybody' loves a blackguard... A Fender rep explained the AVRI Thinline timeline to me once, and now I forget. When did they end? June 2013?