In the US color filters can be obtained from Ross Tabacoff at RT photo repair (at least they could as of 2 years ago). I don't know how he obtained the stuff but he seems to have quite a bit of spare parts for the ilford 500 system (I bought a blue filter and a mixing box from him). Unfortunately, at the time, he did not have any heat shielding glass. His email was email@example.com at the time I bought the spare parts.
Originally Posted by Jeff Bannow