Peter & Gerry, thanks for yr replies. The Beta is in the workshop just now so unable to obtain image of the clock. It is the standard 1st series oval faced one, located centrally in the faux wood console. Silly as am just missing the setting knob... Am happy to buy the whole clock for the knob...
thanks for sharing the Italian eBay link! Yes that is exactly the item I need. The entire fixing component. Bracket and plastic wheel. Cheers for that tip-off.
Jono