I am in the process of doing a coil over setup for my 86. i have st141 struts with 87 volvo 4 piston callipers. does anyone know what discs have the right offset and diameter for this setup? has anyone done this b4 and how did it perform?
Mount it up, measure the offset and diameter you need from that. Then download the dba catalogue from their website. Look through it until you find a rotor with the right dimensions.
You can always redrill the bolt pattern, and even machine the disc to a smaller diameter if required.