nice 65 C10 on ebay ($$$) - BUT, I have a question about mirrors...

[jocko]

Nice truck: http://cgi.ebay.com/ebaymotors/1965-...item4157b51f09

Seems it may be a bit pricey, but it is a very nice truck (minus that seat cover...) - but I HAVE A QUESTION

I have seen those specific shorty side mirrors on several 65-66 trucks, although most 60-66's by far have the stock bent arm with 5" round head (also note that the rectangular head was also available on the SAME bent arm). Does anyone know if these shorty side mirrors were a factory offering or if it's just a coinkidink that several people are mounting the same aftermarket mirror?? (Not unheard of since I THINK LMC sells them). I posted a few pics - the first one is the truck that is for sale, the 2nd is another one that was for sale in NC a while ago with the same shorty side mirrors. The third pic is the normal stock mirror for reference.
Thanks!
jocko