PFF5-303 is an eccentric bush for the M3. This can be fitted to all models throughout the range giving them increased castor to match the M3 setup.
PFF5-304 is designed to fit models where the Anti Roll Bar joins lower arm, not the shock absorber.
For the rear trailing arms use either PFR5-306BLK or on-car adjustable bushes PFR5-306GBLK.
PFR5-5630-10 fits cars with standard or aftermarket rear shock absorber with a 10mm pin, PFR5-5630-12 fits cars with aftermarket rear shock absorbers with a 12mm pin. Neither fit Cabriolet models
PFF5-370 only fits vehicles with manual transmission.
