It's not that easy..as the originals and one for a Viper would be very different.
The original Hurst Pistol Grips were built as part of the handle that actually went into the shifter. I can speak best for 1970 "B" bodies, and for a bench seat or no console car it was a long, straight handle. If the car had a console...it was bent up pretty good. (I have a pic somewhere of the PG in my lime Superbird of years past)
The Viper's would need to be threaded on the bottom.
Anyhow...this is the sample that Gunslinger had me test. It was just about perfect except it needed about 10-20 degree angle forward. (I figured out the angle but don;t remember what it was.)
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