Barry,
I've attached a couple of photos of the ones off my 1750GTV - I believe that they are the same as the ones on the 2 litre cars.
The part numbers are 105.44.59.461.10 (LHS & stamped 61) and 105.44.59.462.10 (RHS & stamped 62).
You will also need a pair of spacers 105.44.59.463.10 (LHS & stamped 3) and - yep you guessed it - 105.44.59.464.10 (RHS & stamped 4).
I got a second hand set for the front bumper of my car from Chris Sweetapple at Highwood in the UK (
Highwood Technologies Inc.) and I guess he should have the rears as well.
They seem to be made from bakelite which makes them hard and brittle - maybe some primitive attempt at impact protection, but then the bumper mounting bolts go right through to the body of the car .....
Hope this helps,
Chris
PS: Sorry about the shadows in the photos.