Like the guys are saying I just measured my car with stock rims and hexes and 5.5mm exotek hexes and 22-4 rims and stock is 2mm narrower. I found these hexes in my parts box, not sure but I think they came from a kyosho, and they are 4mm wide and fit perfect. You can get the correct track width with a couple of shims or hex spacers and use 22-4 rims. Sorry not sure what they came from I'm a pack rat and keep everything for situations like this.
Fyi kyosho wheels with exotek hexes are in the middle at 1mm wider than stock.