Looking for a rear differential(rearend) part for a Honda 300 4X4

Hello,
What I need is a jam nut that hold's the bearing up against the pinion shaft. My bearing shot and ate up the jam nut to the point that I can't reuse it.
And, Hate to pay $30 plus for one nut. SMH!! If you have a shot rearend laying around or the nut I need Please let me know! Because, I'm in need of one asap!
Thank's!!!

I've been doing some research. And, the Honda ATC 250sx and the Honda ATC 250 Big Red. Plus the Honda ATV 250, 300, 350. Of 1988 or older All carry the same 60mm locking nut that I need.