While working on my sons 125 SM today, I had to take the rear caliper apart as it was all siezed up. Also looked at the seals. They looked a bit rough, so I removed them and thought they looked familiar. I work on Goldwings quite a lot and checked against some seals I had in stock discovered the seals are the same as those fitted to one of the Goldwing 1500 front calipers.
Got to be easier than waiting for MZ
Honda part number 06451-GE2-405.
This part number give a dust seal and hydrulic seal, so 2 sets needed for the caliper.
With a bit of luck this may help some of teh posters here.
Keith