Help mounting the power brake booster

Thanks to everyone that has helped me along the way your informaiton has been invaluable.

I got another question. Im now mounting the power brake booster in my 69 fastback. But there doesnt seem to be enough holes in the fire wall for the boster to mount to the fire wall. Is there a bracket that mounts to the back of the booster or do I just drill a couple of more hole in the firewall. There apears to be about 5 threaded rods on the back side of the booster..

The car did have a standard drum/drum setup

Thanks!!

well i got it from advance autoparts I think im missing the firewall mounting bracket . Can this be bought separately