[Dan Heck]

If your housing has been narrowed then I would think that it is configured to mount something other than the Versailles disc brakes as these are large, heavy and unique to the Versailles model so parts can be hard to find. My 9" mounts discs and calipers with a bolt-on ECI kit that uses a vented Trans Am rotor drilled in the Ford spacing and a late Caddy caliper with an integral parking brake. Perhaps EM used this kit as well- it's popular on the street rod aftermarket. I'll attempt to post a picture of my setup so you can see if it looks like yours.

Dan