I think the M double spoke 461 wheels are:
Front axle: 7.5J / rear axle: 8J and have offsets of...
Front: 45 / Rear: 52
The wheels on a 135i are...
Front alloy wheels: 18x7.5"
ET49
and..
Rear alloy wheels: 18x8.5"
ET52
So you might need a 5mm wheel spacer for the front 2er wheels. But I am no wheel expert... maybe someone else will chime in. ?
I don't know why you would want less wider rear wheels though.
sources...
https://www.2addicts.com/forums/show....php?t=1531082
https://www.1addicts.com/forums/showthread.php?t=472551