Circuit Breaker retaining nuts

[River Rat]

For some odd reason I crawled under the dash yesterday and only saw empty holes in the circuit breaker cover plate. Closer inspection revealed the circuit breaker nuts had all disappeared and the buttons had pulled away from the plate. My guess is that the nuts were plastic and they cracked over time. I can't find one (or pieces of one) to see what size they may be to get some replacements. I would guess they are all the same size -- anyone know what that might be? I have called a couple of repair shops but no clues as yet and Malibu Customer Service didn't know either. With the correct size in hand I would think Radio Shack would have replacements...

[cstello]

Mine also fell off. I just need to know where you can just buy the nuts and not the whole circut breaker.