i need to find a 50mm speaker also.............
i ran my batt. dead twice so far not turning off my lights. Doh!
i connected a smaller speaker for temporary use until i find one, but it is not near as loud.
thanks Ian, your write up gave me the courage to tackle this.
tim s.
i just installed a 2" speaker..........
i purchased it at my local electronics part shop.
it is a calrad electronics brand part #20-176.
exact size & no alterations needed.
it has 2w. on the speaker, my original had .5w & it has a plastic cone instead of paper.
$4.50+tax
tim s.