hi guys i picked up a lancer booster and a 120y booster problem is they both have a four bolt pattern to the firewall and my 71 1200 coupe has two bolt pattern do i drill the firewall or find another booster??? thanks ken

why do you want a booster???
if its for racing you will be likely to lose pedal feel and there would be more chance to out brake yourself at critical times.
Datsuns arent big enough in race terms to merit a booster.
I am likely to remove mine with the next brake upgrade I conduct.

I specified LA or LB Lancer booster. You have bought the later model Lancer booster.

The LA/LB lancer booster/bracket bolts straight up, with only a small dent required in strut tower for clearance.

If you and handy with a mig welder and hack saw, you could shorten (section) the booster's firewall mounting bracket, and reweld it up so you don't need to dent the strut tower.

With the boosters you have, you may be able to just go looking for the bracket from an LA/LB Lancer, and use the boosters you already have.

Chris

thanks datodude ,im back to the wreckers thanks to converted the car is to be driven on the street by the misses ken