Can some one tell me the size of the base plate (thing that bolts to the fire wall) for a hydra boost booster?

thanks

For a GM booster on a Jeep it's 4" X 5.25" 1/4" plate with a 2.75" x 4.25" bolt pattern.
Basically you need to match your rig's firewall's bolt pattern and add a 1-5/8" hole for the booster's nose.

http://www.monsterslayer.com/jeep/HydroBoost/HydroBoostTGif2.GIF

Thanks