Trouble is it can be tricky to get the mk2 motor to fit, I found a MK2 motor fitted straight on my cabby, but other tintop owners have said it wont fit the linkage without some modifications and/or swappage of parts. The loom part is easy, chop the MK2 plug off and crimp spade terminals on the wires, then pop them into the MK1 plug matchin the wire colours

Dont think you would need to mess about with a relay?