I just have to weigh in here, I had a lousy experience with aftermarket chrome. First disclaimer: there might be more than one fabricator (in China, Mexico, wherever) so my experience may not be representative. Second disclaimer: I bought my surround about 3 years ago, there may be much better stuff out there now.
I bought an aftermarket surround and it was worthless. It did not fit, not even close. The chrome was thin as a couple of microns, and even if it had fit it would not have lasted. In the three years it sat in my basement it developed the beginnings of pit marks. In a dry basement. My front end has never been hit, and the assembly (original, used, expensive) fit perfectly. And the chrome is still very nice.
So I would just be very careful. My 2 cents.
Greg
'64 230sl, fully sorted out...ooops, spoke too soon