This F10 M5 Adapter piece (part#51128053585) will alleviate you from any cutting on your existing M-sport plastic adapter retrofit conversion if you have comfort access (foot trunk release). The adapter is brand new and never been installed. Local buyers preferred, but willing to ship at the buyers expense.
For more information on this piece, please see the installation process.
http://f10.5post.com/forums/showthread.php?t=812737
I paid $44 after shipping and processing fee from getbmwparts.com and willing to let go for $25.
Thanks.