Rudy Phillips has been reproducing the dash knobs for a long time. They look great, just like the originals. I replaced all of mine in both of my Js about 6 years ago. At that time they were $18 apiece and they've likely increased since then. Regarding window crank knobs, those are riveted on and I have not heard of a good way to replace them. As far as I know, those are not being reproduced but they are the same as those used on 1953 Kaiser Carolina's and I've heard 1952-53 Kaiser Deluxe models but I can't be sure on that. Rudy's contact info is Rudy Phillips 2136
Walnut St, Ramona CA 92065. Phone 760-789-3608 (AM best).