The passenger side tail pipe on the stock exhaust is a smidgen narrower then the driver side so the carbon tip will be a little loose. I solved this with a single wrap of exhaust wrap on the tail pipe and then put the tip over that so it clamps down snug.
The 60mm diameter at the very tip is wider than where it clamps down. There's a bit of a flare at the tip on the stock exhaust.
Drivers side clamps down with no issue.
These are what I bought:
https://www.ebay.com/itm/2x-Glossy-B...c-7317f31e11ed
They look good and pretty high quality for aftermarket. Indistinguishable from the genuine BMW.