[boygenius]

You said that the calipers were from an 1986 model. I'm going to assume then that the rotors are from the same car. 1985.5 and newer 944s use aluminum trailing arms with the caliper mounts molded into them. Hope this helps. You will need to purchase the caliper mounting bracket from a 1985.5 model year and older. I checked the parts catalog on www.pelicanparts.com and it was showing the same caliper for 1983 through 1988.