When I restored my 250 California Coupe (German delivery), I returned to the Bosch headlamps the car was delivered with (according to the data card), removing the U.S. style. Being a pack rat, I saved everything including those headlight clips, so I have three clips: two used and one NOS. I would be happy to send them to you, gratis (buy me a beer someday!) Send me your mailing address if interested.
BTW, the numbers for the clips are: M-B - 113 826 00 12; Bosch - 1 301 329 025
RC
slmrfixit@gmail.com