Because the Z4 M does not exist.
It is technically the M Roadster / Coupe.
Same thing with the Z3 M.
The M Roadster owners used to get mad when some people called it a Z3 M.
"It is not a Z3! It is an M ROADSTER!!!"
A lot of parts searches will still have the Z3M listed as M Roadster, and the Z4M as Z4 M.
I guess after the Z3M, everyone said screw it, and just called it the Z4M anyways.
Even though everyone, including BMW, calls it the Z4 M.
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