Also found at
http://www.vmaxx.de/haupts/cptcext.html
If you can't understand German, atleast these's a nice picture that shows the assemply w/ hub lip. Actually, this looks like a wheel adapter (vs. the simple spacer you're looking for) that would, for example, allow a PT to run BMW 120x5 wheels. I looked into this idea before buying my Konigs but the cost was beyond budget.