The early cars like mine use E36 (325i 1992-1998) rotors / and pads front and rear.
Rear rotor is a solid 280x10mm
https://www.ecstuning.com/BMW-E36-32...aking/Rotors/2
Later cars switched to a
rear ventilated rotor that uses a different caliper.
(When Backdraft started making their own rear hubs)
I assume *meaning PM Cashburn to verify....or contact Iconicparts.com
The later cars use the M3
rear ventilated rotor 312x20mm
https://www.ecstuning.com/BMW-E36-M3...aking/Rotors/2
They use different pads