Chain in question is an EK 520 LVO and I can't find a master link for it. Rather not replace the chain unless if I have to, HELP! Off of an old Ninja 250 if you are curious, the pin size is just under .200 inch and all the new links seem to be a bit bigger.
Trying to get through to Vortex/EK now. Ok, I got through to them, seems that they don't know either, so they are trying to get some info from EK Japan.
Ended up going to the three local shops with a dial caliper to measure their collection of loose master links and found a current DID link with the proper measurements. Old bikes are fun, aren't they?