Just thought I'd share experience of using the track spacers on my Puma - I've got 20mm (21mm?) spacers on my car which I fitted while changing my rear beam and sprucing up the rear brakes.
So in summary: standard beam + 2x 20mm spacers + standard (ET38) wheels = no rubbing on bodywork (at least I haven't experienced any yet).
Needed to change the ABS sensor but the tip about swapping for an Escort Estate assembly was a good one - I can't remember p/n but it's actually a pair of sensors with the plastic bracket to fit to beam. I needed to be a bit creative fitting the plastic bracket to the beam as the holes don't line up, but if you have a drill and a brain you should be OK.
Oh and you'll need longer bolts to secure backplate onto beam - I measured the old ones which were 30mm thread length x M10, then ordered 8x 50mm M10 10.9 grade bolts (30mm + the 20mm spacer).
So in summary: standard beam + 2x 20mm spacers + standard (ET38) wheels = no rubbing on bodywork (at least I haven't experienced any yet).
Needed to change the ABS sensor but the tip about swapping for an Escort Estate assembly was a good one - I can't remember p/n but it's actually a pair of sensors with the plastic bracket to fit to beam. I needed to be a bit creative fitting the plastic bracket to the beam as the holes don't line up, but if you have a drill and a brain you should be OK.
Oh and you'll need longer bolts to secure backplate onto beam - I measured the old ones which were 30mm thread length x M10, then ordered 8x 50mm M10 10.9 grade bolts (30mm + the 20mm spacer).