7” dual diaphram brake booster

[1965comet]

I currently have a 6” single diaphram booster bolted to my firewall. I want to go with a 7 or 8” dual diaphram. Does anybody have a brand that bolted right on that they would recommend?

Thanks

G

[1965comet]

The booster I have is mounted with only 2 bolts. Most boosters I see have 4.