I'm pretty sure the ION grips will fit.
I just looked on Smart Parts dot com, and see the "Pro touch grips" listed under the ION, that I know will also fit the SP-1.
Bob Long Vice
Bob Long Protege
Bob Long Classic -Project
"Originally posted by gamer565: I can't believe its not butter, cause it sure shoots like it."
"Originally posted by lucasicool: im more excited than rebecca black on a thursday night!!!!"