I have everything up to 20mm.

So I really need to buy 2 to get me out of trouble. I'm sure the jam nut is 22mm but I'm only guessing at the other one. Looks like I'll have to get one out to the parking lot and test drive it before I buy. If I find out before anyone else knows, I'll post it here.
BTW, I'm sure it's a tie rod end. No movement at 12 and 6 but I've got play at 9 and 3 and I can see it moving when I do it.