I am switching over to power brakes this weekend and need to make sure the backing plate that I have is right for the power brake booster.

The master cylinder I took off the car has 2 bolts coming out of it. The power brakes have 4 bolts.

The backing plate has 2 open holes (from the manual brakes) and 2 holes that are capped. If I remove the 2 caps, all the bolts in the power booster line up. Should this backing plate work (and all parts line up for power brakes) or is there another backing plate I will need to buy?

Thanks.