Sadly, the seals in my brake master are on their way out. This is the 90-94 OEM part that has the integrated ABS modulator.

I'd like to replace the seals but I am having difficulty locating a replacement seal kit for this particular part.

Has anyone replaced the seals in theirs and know where to obtain them from? Alternatively, has anyone sent one of these brake masters to a specialist for refurb?

I'm also aware that an alternate option is to replace the brake master with a Discovery version. But I'd prefer to keep the original if I can before heading down this track.