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I'm not exactly sure what size the jellybean wheels were considered, but some of these Duratrax tires would work.

https://www.rc10talk.com/viewtopic.php?f=111&t=43983


https://www.rc10talk.com/viewtopic.php?f=111&t=43414

The 1.6" rear size is what you're looking for. The Kyosho KYOOTT243M from the Optima (not turbo optima and not optima mid) is another option. KYOOTT243M. They are also used on the Javelin.

You did a great job on the cleanup of that car. It looks pretty fantastic.