Rear wheel cylinder - what thread are the 'tube nuts'?

[Paul Y]

Evening all,

Quick sanity check as I want to get the brake system buttoned up on old Woody before the weekend and need to order parts.

What thread are the rear wheel cyclin dress on a 66 C10?

Found a few contradictory answers on the web so thought I would ask here as I trust your opinions a lot more than NoobMaster69...

So, do I need to order for my 3/16" line, tube nut with 9/16-18, 1/2-20, 7/16-24, or 3/8-24 thread?

I 'think' I need 7/16-24 but would appreciate confirmation.

Thanks in advance.

P.