| I think (but can't quite tell) that those are chrome dome knobs...plenty to be had on eBay for a good price. I'm about to find out how universal knobs are--from what I understand, most knobs will fit most guitars/basses, and I'm hoping that's the case, 'cuz I just ordered some snazzy ones for my P-bass (about to swap out the pickguard and naturally need knobs that look decent with it). Hopefully they'll fit--and hopefully whatever you find will fit yours as well! Good luck!
Oh, what might help also--measure how long your pot shaft is, there's a couple different sizes--and note if it's split-shaft or solid shaft. Some knobs will not fit either type--but it seems like sellers note that in the ad...
__________________
Finally getting around to His work...
| 
