Yes, unlike other people I have had no problems with their parts staying in place in my XF, however save your money and buy a really nice can of metallic spray paint.

Assume that everything they sell, unless it specifically states otherwise, is painted plastic.

The seat belt surrounds look fine, and as long as you don't touch them you may not know they're plastic. However, by weight, $40 buys a lot of plastic and chrome paint.