I don’t know if this is any help but there is something similar in this picture. Maybe the wire harness has been changed at some time.
If they are the ones I’m thinking of they will be JIS - Japanese Industry Standard. If you haven’t got a JIS screwdriver already, I recommend you get one and use it in conjunction with the penetrating oil, and patience. I found the JIS made a difference. When they engage in the screwhead to undo...
Here's my '96, standard but reliable and I can ride it all day if need be. When bought it needed a few things to make it right, leaking carbs, some vacuum problems, notchy steering bearings etc. But I love it.
2nd post, thanks for letting me join. I prefer the forum environment to others. Here is my bike, pretty much standard, but that's how it came together after a bit of tidying up. Some pictures of recent tours. Cheers, Rob.