Hey, I recently joined this forum & noticed you did not have a reply to this post. Just in case you've not had any luck yet,
I ordered a Colgan Custom Bra for my 87 560SEL thru www.sportsimportsltd.com. You can also contact
Colgan direct thru their web-site, or call them for any help.
It was suppose to take only a few extra days , if not in stock. Of course it wasn't, since I wanted mine without a license plate opening (extra charge). Finally got it 5-weeks later.
Was worth the wait & reasonable price. They only listed a cover for 1991 model, but I knew it was the same. It's a perfect fit.
You may need to do the same depending on what Colgan offers
based on model's & years that are like yours. Hope this helps.

MO560SEL