Very commion in the bike wortd, and equally common to lose them!
Google 'battery square nut' and you should get a heap of options. Couple of quid for a pair in the UK.
The worst bit is when you may have a couple of accessorites hard wired to the battery and the bolt doesn't quite reach far enough in to hook up with the nut, so you end up trying to lift the nut a couple of mil with a thin screwdriver (rather than dig out a correct length bolt). Always end up flicking them out, and as I often work on a gravel drive, that's the end of them.
Always remove and store them when I chuck an old battery away.
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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