Thanks for the links. I was not able to figure out anything out. I am officially giving up. I talked to 2 Nissan dealers(parts dept) today one on the phone and one in person . They ran the VIN's. They gave me a # for Bosch and Blaupunkt. I talked to 4 different people at Bosch and Blaupunkt. No one could help me. Nissan wants $1,500 for a new headunit. I looked on ebay. half the headunits for sale have the broken knobs. Add me to the list of people that will never buy a Bosch or Nissan product again. pretty pathetic when I can't by a defective knob for a 4 year old car. Thanks for the help! Notice the broken left knob on this POS.