Citroen – Peugeot OE used to supply: 1201G4, 1201J1 PPS housing + PPS backhousing ( impeller Ø 55 mm ) 1201G5, 1201J2 PPS housing + PPS backhousing ( impeller Ø 61 mm ) Now Citroen – Peugeot OE supplies: 1201K1 ALUMINIUM housing + aluminium backhousing SUPERSEDES ALL THE FORMER OE PARTS SALERI OFFERS: PA1055A = OE 1201G4, 1201J1 WITHOUT backhousing - suitable to be fitted on the OE plastic backhousing ONLY. Impeller Ø 55mm PA1281A: OE 1201G5, 1201J2 WITHOUT backhousing - suitable to be fitted on the OE plastic backhousing ONLY. Impeller Ø 61mm PA1437 = OE 1201K1 WITHOUT backhousing - suitable to be fitted on the OE aluminium backhousing ONLY. PA1460 = 1201K1 WITH backhousing - suitable to replace all the OE references. Water pump technical information sheet : Comparison of PA1437/PA1460/PA1055A/PA1281A