Went into Walter Bros Harley (Peoria) yesterday and the kid spent about 20 minutes trying to find the quick-check tranny dip stick. He finally said they don't make them for the M-8. According to him the only ones available are up to a 2016, even in his aftermarket sources.
I checked J&P and they had one for about $19. Instead of having to get an allen wrench down in there it has a knob on top. Should be a lot easier to take off and on.