Source for tabbed anti rotation washers

I need some way to keep my toggle switches from rotating in my panel. A few of my switches have a tabbed antirotation washer, most do not. Does anyone know where I can get more of these, or is there a better way?

Thanks,
Duane

Try Mouser. Part #AT506M

http://www.mouser.com/index.cfm?han...uctid=197991&e_categoryid=142&e_pcodeid=63304



-Paige