The 124 Spider knob looks to be the same overall dimensions as the S1 Beta. The only thing is that the colouring of the wood tends to be more 'blonde'.
I found that the Fulvia 3 knob has the same thread fitting, but is slightly slimmer in diameter.
An S1 Beta will come up, if you wait long enough. Rare, but not that rare:
http://www.stratosec.com/Forum/showt...ype-wood-knob?
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