Jags also use the same pump arrangement on the back of the dynamo. Not a very good set up because you get all the disadvantages of a dynamo, and the fanbelt needs to be too tight so it will drive the PAS pump, and that knackers the water pump.
I'm in the process of doing a conversion using an electric pump. (Along with all the other projects!)
If you're sure you want to go the dynamo route, I think I know of someone who has the Jag ones and I could make enquiries.
Edited By harveyp6 on 1201642205