Yes, based off a boosted setup. And going off what the gent at AZC said in regards to the 6 pot fronts, 4 pot rear Wilwoods, even he recommends 15/16th, so i imagine that since my 7/8th MC isnt quite up to the job of the same setup as you atm, then 15/16th would be spot on. I dunno. However, yes PBR make a 1" that bolts on to the booster but the lines just need to be modded.
I have a Patrol 15/16th one aswell ready to go, plus i will get a 1" and then its simple to change should i need to.