As above looking for a battery clamp with the ‘J’ hook part for my D1 300tdi.

Turns out the last owner has fitted a huge battery which has nothing more than a strap over it which does nothing at all!

M6 thread rod, heat the end and bend around a bolt to make a nice curved bend in it, fit it in place, clamp battery down and cut off the excess with a hacksaw and then paint it with a primer and top coat.

Can use M8 if you want to go OTT but M6 is plenty strong enough.