For reference, I found the part number for the RS250 coil mating connectors.

Sumitomo 6189-0533 HW 090 Series 2 Pin Female.

I recently bought a kit on Amazon that had 5 of them for $10US.

https://smile.amazon.com/gp/product/B079FZHR3N/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1#productDetails

A few months ago I happened to see a pair of used RS250 coils for sale on the Japanese auction site....I was surprised at the high price. I did a Google search on the part number and oddly enough it turned out a dealer in the US had one listed new for what I thought was pretty good price. I called them and found out they had two so I bought them. Hence, my quest to find connectors. I'm in the process of rebuilding my engine after a seizure. I'll fabricate some brackets and install them. I'll post pics on my build thread when I get to that point. Should be easy enough to make a short harness that mates to the stock harness space connectors.

I'm not sure which pin on the RS coil goes to which on the harness. But not sure it really matters either since they are isolated from chassis.
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MC28 SP