If you do a search on here I'm pretty sure there is a Yamaha kick starter you can use also.
Here you go, I found it.
The YZ250 kicker will fit. Most like that it's a bit longer than the OEM item. Here's the latest part number 5NX-15620-20-00 that supercedes 5NX-15620-11-00 which superceded 5NX-15620-00-00.
Good to know skidad, but i am hunting a kickstand (side stand?) got one an my KX450 and now i wonder how i rode 30yrs with out one! But man you guys are really on top of things here. I am glad to have found this sight. I am really digging my Gasser!