I've just had the same conversation with the local motor factors we use ?
They sent me a unipart pump listed for 2wd Cosworth and when it arrived it a alloy one but has the same size and style of impelor that my cast Cosworth one has?
I rang them to say it was wrong and even gave them the reg number of the donor car to use the look up and they still list it as correct for a 2wd YB
So the question is will it be up to the job ?
Cheers paul