@Stereoboy70, download the manuals for your receiver. I would get some others as well. In the G-6000/G-7000 manual, you should find the part number for the knobs you're looking for. Look in the other manuals to see if these knobs are used on other models. You really don't know until you do some digging.
As for used parts on Fleabay. When these folks buy units to part out, there are only so many parts that have value to buyers. Most of the time, the missing bits are cosmetic. The wood bits, knobs and the face are other bits that are sought after. So, the asking price for any of these items will feel a bit steep. Ultimately, it's going to come down to your willingness to pay. If you just need a knob to make it easier to tune your receiver, then there might be other options for you.
I don't think you will be able to find a G-6000 for less than $150, just so you can salvage the knobs. A number of years ago, this might have been possible. But, not now. Units that sold for $400-$500 ten years ago are going for far much more. It is eye popping how much people are paying for G-6000, G-7000, G-8000 and G-9000 units now-a-days. There is a lot of value in your receiver. Getting the right parts for it will ensure that it gains value in the future. You don't need to buy all of them in one go. Buy them one-at-at a time and before you know it, you'll have all of them.
Getting the right parts for your receiver will add value.
