Colt Viper Grip Question

Hello all,

I recently ordered a Colt Viper 2024 online and the stock grip options seem slightly too short for my preference. I was looking at Altamont grips and learned from their customer service that their grips go 1 1/2" to 1 3/4" past the bottom of the frame. Does anyone know how far past the stock grips go on the frame, to compare? I won't have the Viper for another few weeks so I can't measure myself. Thanks in advance.