My Mtech front bumper with Akrym lip fit perfectly.
My rear Mtech style bumper was from JGMODS if I remember correctly. It fits fine and I bought a CF insert from Ebay and it also fit fine.
No issues with either of the products which I was happy about. I know the body shop and they said everything fit fine, no issues. Pics in my sig link.
Oh, my CF high kick rear spoiler I bought on ebay and painted it as I don't like unpainted carbon so high up on the car. It did not site 100% flush, but very close. 3M body tape took up the slightest gap and you would never know it was not OEM imo.
edit:
https://jgmods.com/ <-- I bought it on the forums through a group buy on e90post.