OK Here goes...
I found all this out years ago after I got my first Escort when it was 9 years old and spent a few weekends trying to find the correct one.
Talking Mk2 Rubber bumper bar overiders only too...
There are fluted and round shapes, deep and shallow sizes and to suit a bumper with or without the rubber strip. So when you start looking at combinations there are a few different ones, although I never found every variant back then. (I think the shallow versions are from the earlier Mk2 cars as that is where I seem to recall finding/seeing most) Without the rubber strips are the ones you probably require if your car is a real rally pack, but these are also the rarest and probably most difficult to source too...
I have seen
- fluted deep with strip
- round deep with strip (what I needed for my 79Ghia at the time)
- round deep without stip (found on the later rally packs with bumperettes)
- round shallow without strip (very early rally packs I think and very rare)
- fluted shallow with strip (early Ghia maybe??).......
I got one in a box of spares (short round one I think) that I picked up the other day, but I have not put overiders on a car in over 10 years as they got too hard to find good full sets. Mostly the locating screws at the rear of them that hold them onto the bumper clips rust solid over time and have to be drilled out to get them off the bar. (Then they are scrap)