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This rear reservoir had two screws under a clear plastic piece that you can see to the right of the reservoir cap. Once I carefully pulled that out of the reservoir, I could unscrew it from the metal body and get at the o-ring.

I'm still bleeding the air out of the system. I think the air in there is still pushing fluid out through the seals overnight.

I replaced my Rear Master Cylinder on my 77 KZ 1000 with a MC from a 2005 Harley Davidson Sportster I can get you the part number if needed, it has a remote res. and all you have to fab is the connection to the brake pedal.