I would assume any 8V fuel rail would work most of them have a metal outlet for the inlet fuel pipe I would use the original ECU that came from the ABF to save you problems further down Not sure if a Digi II would be suitable depends what the whole set up, but the mapps are proberly simular in spec just a few more BHP to cope with the MK3's weight.
You would need to ask someone like Diamond Hell he is our resident ABF guru on here!

I think I have a spare fuel rail somewhere.
I can always post a picture if I find it!