It is a bit of a hunt. Did it myself. I found all of them on eBAY, but it took a while and a lot of money *for knobs at least". Dakaware are not the correct knobs, if you are really being a stickle for original. General Radio as you mention in your title are the correct ones. Mine are at work or Id give you the part numbers off of the back. It will make your hunt a little bit easier.
edit: I remember the big ones are KNSP-8 General Radio