Been looking around google for some time and the only thing that seems to pop up are only front license plates. Haven’t had any luck finding any rear s5 license plate holder, trying to do a s4 tail light conversion to the s5’s.

 

Post a want to buy ad in the 2and gen classifieds section. I'm sure you will find one there. I don't believe that they are available new any longer unfortunately.

 

It's worth noting you can also modify the S4 license surround to fit (I did this), although it does feel a little flimsy at the top post-modification. There's quite a bit of structure at the top that needs to be cut away.

 

Mazdatrix still lists them and they are usually up to date. You will likely find one cheaper in the classifieds.

https://www.mazdatrix.com/product/le...r-89-92-coupe/

 

FC01-50-850, is the part number and Mazda has them, list is over $200, used seems a better option