Walked into an unexpected car boot sale yesterday, and waddaya know: found a pair, NIB. Remembered your quest and bought them. Let me know if you're still interested. For €2 they can be yours!

I was wrong on one account though: I thought they were introduced in the late seventies, but it was actually a decade later:



"Fits 26", 27" and 28" wheel sizes". We all know, of course, that it should read "26", 28" and 27".

And that a "round circle" is a pleonasm.