I asked Giles a couple years ago, here's his answer:
yes we are building M-TDI pumps and yes we need two donor pumps for sure.
a TDI pump and an AAZ pump to make the base pump from.
cost is $1400 with you sending in the two pump cores, if you need them we have for $350 each
it comes with the the TDI original head, if you want a bigger one I would have to purchase one from Bosch $1000 more
Giles
Performance Diesel Inj.
The Fuel Injection Specialists
905-940-2266
No Rover pump required. The only possible reason to send Giles a Rover pump plus something else would be to put the Rover guts into a housing with the smaller nose that fits the stock AHU bracket without modification. I certainly wouldn't spend my money that way.