Oil Pump Assembly 751-12021 complete with gear.  This is the most recent type, replaces 750-12020, and early lower volume pump 750-11360. This fits the whole Lister-Petter Alpha range with the exception of the LPWT4, so fits LPA2, LPA3, LPW2, LPW3, LPW4, LPWS2, LPWS3, LPWS4. This higher volume oil pump is also required where a pre-1991 engine is being modified to use later controlled expansion pistons. If you have any questions please ask. 

Telephone 07415426368.