it appears my 89 lebaron needs a new brake booster.
this car was originally TBI with 14" wheels and I have converted it to Turbo and plan on converting to 11" front brakes.

I already have a new master cylinder for the 11" brakes, which brake booster should I use?
parts catalog lists a single diaphram, dual diaphram and something about with or with out a site glass.

is there really a big difference? would there be any significant size difference or fitment issues?