Received oversized turbo gaskets, could I shave off mm?

Seaneezy

Corporal
Mar 12, 2018
133
34
0
Ride
e90 LCI 335i
ECS sent me ajusa turbo gasket rings in the install kit that are too large to fit the downpipe v-band off (tested with old worn OEM gaskets). Is it possible to shave/sand one side of the gasket to be shorter or is the coating important to keep? Dealership wants to charge me $75 for a pair of gaskets and I don't really want to wait shipping time for new ones if I can get it done tomorrow. I have tried lightly malleting in the gasket but it doesn't do much.

The alignment of the v-bands is correct, I've taken off and installed my DP's tens of times by now, and they fit fine when taking the gasket out.