I have a client who has Thermador gas range built, I think, in about 2000. They only need one of the small knobs on the front of the unit. Unfortunately, I cannot find the data plate anywhere on this thing. I went to Thermador's website to show me where the plate is but it's not there. Is there another place for this information? I have contacted Thermador and they had some nice lady on the support line but she couldn't find the part even after describing the unit to her. It's just a simple knob. The stove works fine otherwise. Thermador website says they don't make the part anymore. Any ideas?