Outer Limits 4x4 Board

I've got a set of IPF900's that I've HID'd, and I'd like to keep using them. Except the chromed outer ring is rusting away and its kinda getting a bit too bad to be using an expensive HID kit in.

Anyone ever seen spare parts for them, or know of a set of outer rings that aren't being used??

Cheers,

I think arb can order most parts in for these