Rotor help...please?

Hi there,
I am installing disc brakes on the rear of my 90lx, using (what I was told) parts from a '94gt, including the axles (ABS). Everything fit fine until I tried to buy new rotors for it. The rotors I have are not from a gt, nor a cobra. The offset of these ones seem to be more than all of the rotors I have ordered or saw (axles are aprox 1" longer than stock). I have tried numerous places, including ford, to find these rotors. Here are the sizes, and a link for two photos:
OD= 11 5/16" (11 25/64"?)
Lug circle= 4.5"
Hub ID= 6 7/16"
OA Height= 2.5"
Min. thickness= 22.75mm (in casting)
Other markings in the casting:
Century 636001
and of course, left or right

http://img.photobucket.com/albums/v434/ONP-iAmCDn/DSC00781.jpg
http://img.photobucket.com/albums/v434/ONP-iAmCDn/DSC00780.jpg

Hoping someone here can help indentify these.... :bang: