I find that the TRW (LUCAS BRAKES) web site catalogue is quite useful. Take a look if you have not seen it yet. BUT: It is not perfect, asuming ETKA is? ETKA lists S2 type twin pot front clipers as being fitted to some late model V8s and UR S4s (200). TRW does not! ETKA, of course, shows four pot Brembos on the front of RS2s. TRW lists standard UR type front discs and caliper carriers! http://www.trwaftermarket.com/en/Ne...ramme---Publication-No-XDD910C-AVAILABLE-NOW/