Here's a couple links with pics of what you might be looking for:
On Thu, 03 Mar 2005 19:23:32 -0800, Spike <firstname.lastname@example.org> wrote:
>Not absolutely positive, but I would think just about any of the
>classic pony parts vendors (www.mustangs.plus, www.thepaddock.com,
>www.karmustang.com, National Parts Depot, etc).
>On Thu, 3 Mar 2005 20:27:40 -0500, "MJT" <mjtheriault @
>>Any advice on where I can find seatbelt anchors for the rear seat
>>I read that rear belts were optional at the time, and required a dealer
>>installed seat belt anchor, but haven't been able to find anything on the
>>net. Any advice or source you can point me to would be appreciated.
>Hey! Spikey Likes IT!
>1965 Ford Mustang fastback 2+2 A Code 289 C4 Trac-Lok
>Vintage Burgundy w/Black Standard Interior
>Vintage 40 Wheels 16X8"
>w/BF Goodrich Comp T/A Radial 225/50ZR16