locate injector pump?

Hi there. Where can I locate an injector pump for my renault trafic 1986 2.1 diesel engine? The pump is a CAV ROTODIESEL TYPE 233 234 0. Does anybody have knowledge of this model? I believe there were 21 only of this model trafic cab and chassi imported to NZ around 1984 -86 for fibreglass campervan bodies by crestacraft.
Cheers from Stewart in NZ