Thanks for posting up the parts pages. After looking at the crank pdf, item 13 must be the gasket that is being referred to. I double checked my tractor and sure enough after taking a razor blade I was able to peel up what used to be this gasket from the front face of the gear on the crank. I sure couldn't tell it was there as it blended right in.

I may just have to count the number of O-rings I find in the steering cylinder. Looking at the pdf for it, I don't see the oring I'm questioning in relationship to the rest of the parts, but I'm sure its there. Once I get the oring kit that I ordered I'll figure it out. I'll just match them up.