WTB Correct Air Filter Box

[ABZY]

Looking for correct sir filter box for 1974 csi suitable for m30 engine

I think there metal ?

Does anyone have part number even if not the part.

Is it used on other cars too? Given m30 very popular on various models

 

[Wladek]

CSI filter box is metal, it is pretty rare & also expensive. Was available only in E9 CSiL, CSI, Alpina & E3 3.0Si, that's why it is pretty rare.
Some reference photo's: