Casting my curiosity aside as to why the 126 should be saddled with more weight than it already is, you might want to try some fibre glass builders who might fashion the design for you.

It is extremely a rare request you have and I doubt if you might easily find some after market spoilers for the 126.

However, the naked tells me the 560SEC and the saloon ought to fit. Unless my eyes can't measure the extra few mili-metres short.

__________________
... Kerry

126 tailed by a 203, 129 leading the pack.