I've got an old Blaupunkt radio that is missing its knobs. On each side of the radio there should be the standard D-Shaft knob, plus an outer "ring" knob that slips on first and engages the double slotted outer shaft. (4 pieces total) Does anyone happen to have a set of these in their pile of radio parts or know where I might find some? Ebay didn't turn up the right ones. I would prefer chrome but I'm not all that picky. Anything looks better than two pairs of vice grips hanging from the shafts. I'm attempting to attach a photo of one of the shafts but for some reason I always find that challenging. Thanks for any help.