bolt pattern power booster

[mopar440]

hey i need to order a replacement booster i would like to make sure i get correct one. should the firewall bolt pattern be the same master cylinder. 3 3/8 x 3 3/8. i my can measure it from inside but its very thigh and awkward . i think i have a 7 inch dual booster from speedway motors . was on car when purchased. thanks

[67440Dodge]

I won't be able to see if I still have the booster til the weekend, I'll measure for you if I got it still. I don't think I got rid of it during the Great Parts Purge To Piper

[67440Dodge]

Sorry... I gave all my boosters away so couldn't measure.

If memory serves me right a friend did the Speedway conversion to is Challenger, and the bracket bolted right up to the existing manual brake mouting plate.

Easy way to check is to go to parts store, get a brake MC from anything from your car to a Diplomat, they all have same bolt pattern. I know cause mine is off a Dippy