It'll be interesting to see if you get a result from either of those firms.
Some time ago, I sourced the rear diff seal (70x80x10 from memory) from Bundaberg bearing service and after finding out that they only cost $2.80 each, I got a couple, plus one more for Geoff while I was in there. Then geoff suggested I see whether I could get fork seals, so back i went and discovered they had no listings for either the 37 X 49 X 8mm, or 37x48x10mm to fit the Special \ RH's
So hope you have better luck down your end.