Where Can I Get Knobs to Replace Missing Knobs on 002R?

[akakpaws]

I recently bought an "out-of-the-box" Digi 002R from Guitar Center, Oakland, CA. The unit was missing several knobs on the front panel. At the time of purchase they promised to order the replacement knobs, but so far I have only recieved excuses when I inquire. Any suggestions how I can replace the missing knobs? Are these sold by Digidesign? Are these knobs fairly standard and can be purchased at an electronics store?

Thanks Anyone