O-ring size for steering box endcap

[WJACKSON11X]

I some how misplaced the O-ring while replacing some seals on the box. Anybody know what size it is? I tried the local parts stores, but I have to get the whole rebuild kit which cost $46.

 

[Mark1968]

I just got a rebuild kit last week. I'll open it later and get a pic.

 

[WJACKSON11X]

Found the O-ring. It was up inside the box stuck to the piston.