Pitman Arm Nut and washer

[Cbridgewater]

So I replaced my steering box and a new pitman arm came with it, but no nut or washer! What size do I need? Ordered the one from rosevillemoparts but it's too small!

Here is the box: https://www.cardone.com/product/steering-gear-27-6581

Can you help??!?

[Jay Bee]

Other sites say the socket size for an original nut should be 1 5/16" if that helps any.