Demountable camper group

Can anyone point me in the direction of a website that sells threaded hooks for turnbuckles? I need some different lengths to the ones I have (which are only threaded part way).
I need M12 x around 350mm but with around 150mm of thread.
I can only find short rods.

Thanks

Tried local chandlery shop yet? lots of useful stuff there usually

www.lsengineers.co.uk/eyenut-30mm-12mm.htm
Why not use something like this? You can buy M12 studding 1000mm long.
That is what I used but instead of an eye nut I used an extension nut. That enabled me to put a clamp with a bolt through a hole in the camper.

OnTow,
did you source any of these in the end, I've usually bought from a barge/narrowboat shop locally but I think I saw an online option once as well