Landrover Disco Pump Part number

[T3-mtdi]

I was searching for the partnumbers of the Discovery pump, that can be pluged into a mtdi.
I found these numbers in Esitronic, but I think its almost the same pump.

VE4/11F2000R509
VE4/11F2000R509-1
VE4/11F2000R509-3
Is it the right Pump or am I completely wrong.

[T3-mtdi]

I should have tried the search first. I found the answer and im happy now.
But what do you think, which pump has the best ignition timing changer( i dont know the word for it in english but i think you know what i mean)
AAZ/2.8 ATA/Disco/Cummins?