Mk1 Aygo battery clamp bolt

[Ahar]

Hi,
I've got a new Battery and I've just picked up a long extension bar for the socket so I should be all set to replace it. Going to give the WD-40 some time to hopefully penetrate into the threads first - it looks very rusty.
Just wondering if anyone knows what the specs are of the bolt for the clamping plate if I wanted to put a fresh one in while I'm at it?
Thanks

[flash22]

Should be no need to replace it, it should be that rusty, dont try to take the nut off it one go if its tight work it backwards and forwards to clear the threads, if it is ultra tight try nipping it up then back it off

[Ahar]

Thanks. Just swapped in the new one and it wasn't too bad at all considering it's been in there for 11 years.