By happenstance, I ended up with an S steering wheel. 400mm, original leather covered. In very good condition -- a few knicks. Wants me to sell it. $350 shipped. Date stamp is 1970. Part number 901 347 081 10. It DOES NOT HAVE an extended hub. It comes with the horn (but not a hockey puck)
If anybody is interested, please email me at geneulm at pos dot org and i will send some pictures. If not fair price, let me know that too.