For anyone else who wants to order one of these: the counter bore recess is 0.60" by 0.20" depth. This is to accommodate the jam nut that Hurst uses. My total cost is pennies under $100. The counter bore cost is $30 extra. BT suggested I just use the set screw that normally comes with the ball to lock it against the shaft. No, I don't want to mess up the threads on the shift stick.
Further info: The OD of the jam nut is 0.55" and the ID of the Hurst knob is 0.65". I just went with 0.60".
2004 SRT-4, AGP Delta 46
Michelin Pilot Pro A/S 245x40x17
3" Maxx Fab exhaust
Mopar STS, AGPCAI, Katzkin SRT-4 covers
Modern Performance 62mm throttle body
AGP Race Intercooler, Hard Pipes
HKS SSQ BOV, Booger Bushings
AEM EMS, AFR Gauge/Wideband sensor
AEM Boost and Fuel Pressure gauge
Hotchkis TVS kit, Mopar strut tower bar
Walbro 255lph fuel pump, Fuel pump rewire kit
AEM MAP sensor 3.5 BAR, ACT DN4-XTSS clutch
AGP 750cc injectors,