Hope you found the info you needed. Title of your thread is perfect, can't resist the temptation to avoid starting a new thread for my own surefire aftermarket parts questions.
I want to run MN60/61 or G4 bipin socket in an M3 with a z46 head... thus I believe I am looking for a reflector that fits z46 that will accomodate the larger assembly for use on typical M body. Turboheads are nice but big and expensive, would prefer smaller M3 head, though the lamp opening for the M3 reflector is obviously too small to accept a MN60 or G4 socket. Are alternate reflectors available for z46?