Help me identify this part on my 87' 535i...

My 87' 535i is missing this part on the rear bumper.

I did a search on realoem.com and it looks to be part number 51121868523, and it looks to be one big piece.

But from another website, it's called the "rear bumper impact strips", and it looks to be 3 pieces. http://data.bmrparts.com/bmwparts/BM...121868523.html


Can any e28 experts help me with this? Is it actually one big piece, or 3 separate pieces?

And where is a good place to find this?

Thanks!!!