Handle Bar Balancer question

[Slashback115]

I have taken it apart, since its basically falling off, and did some looking at the manual. Basically i need part #09159-06024 (Nut) and # 56272-44500 (Expander).

I have found them online for only 4 bux, but with 20 dollar shipping. is there a generic nut and expander i can use? if so, what size do i need? (They are missing, so i cant compare at an auto store)

Thanks!!!!