125-200cc Nice E Bay shifter for WR300...or 250.

Stock was M6x20mm, I found 1 in my collection 25mm. Not long enough for a locknut, but it works.
No local nut and bolt shop near you? I've got what's left of an old Euro metric bolt kit too, comes in handy.

Home Depot has a fair metric selection and a big Ace Hardware will have a better one. You don't have those stores in Kentucky?

i live in a pretty small town and our metric selection is fairly kickass considering our small town hardware store! lots of stainess metric as well.

Have all those chains here. But, quality metric (or SAE for that matter) hardware is rare as hen's teeth. Usually poor selection in size, quality control on those chain store bolts is lacking, and they are usually soft/weak steel even at supposed higher grades.

Fastenal may have some quality bolts, but in a size that small... It's questionable.

Heath

Mine is holding up OK after a couple of rides with just opening up the gap with a file....

The gap on mine is almost closed now and will need filing if it loosens up again.
There are nut and bolt kits available at most of the online MC shops, not sure of the quality, maybe Halls or Bills has a source for the good stuff.