Check out this company on EBay, they may have what you need:
HURST Shifter Components, Flowmaster Exhaust items in hurst-shifters store on eBay!
Here is an example:
HURST Mopar 4 Speed Street Super Shifter Install Kit 3738617 A Body 373-8617 | eBay
I've never bought from this company, but they offer a lot more parts for Hurst shifters than most so I keep them bookmarked just in case.