front brake drum keeper?

[1972 highboy]

sorry i dont know what the part is called but it locks the inner large nut when you put the drum back on and it goes right between the inner and outer axle nuts.it is some type of keeper to stop the inner nut from backing off.mine is worn out.any info on what its called or where i can find one.its for a 1972 highboy.thank you.i hope i made sense out of all that.

[1972 highboy]

found one on ebay.thank you