Fuel level sender for P5B

Our petrol tank level sender has suffered from corrosion and the copper windings have almost completely disappeared. I considered trying to rewind it but think it may be better to look for a replacement unit instead. Can anyone suggest where I might be able to source one, either new or used ?
Thanks "unstable load". I think I'll need to pull it out again when the petrol level gets down a bit and take a photo of what I have, because I don't think it really looks much like the Wadham P5B model. Rover could welĺ have used up some old stock when they assembled for the NZ market.