u/KIPS_LIKE_32YRS_OLD

I'm trying to fit a Nissen 60759A radiator into my 328i and as I believe it's M3 size and therefore a little too wide for the radiator mount cups.

Am I better off cutting the rubber mounts or the cars radiator cup mounts? Both? One pic is with OEM rubber mounts the other is with Powerflex PFF5-4652 for BMW E36 inc M3 X 1.

It's a UUC water pump pulley. I've removed the 4 bolts but it won't come off. Thanks for any tips.