Or install a really cool, period-correct AM/FM/8-track player. Unfortunately with the rallye cluster, once it's been cut - you find a new cluster. There's no easy way to rebuild that.

I had the same issue with my Swinger years ago. Somebody had hacked the dash very poorly for a cassette deck. I cleaned up their hack job as best I could, found a Motorola deck that fit and used the factory knobs. A lot of people mistook it for factory - even some hard core mopar people!