Masonry opening size for exterior door?

I'm being asked to supply a masonry opening size for a pre-hung external door that I want placed in a new precast concrete basement wall (Superior Walls). I know the rough wood opening spec for the door is 44 1/2 " wide by 82 1/2 " high. I'm trying to work from that and add for the wood framing that I would need to get to the concrete opening size. I'm thinking adding 6 inches to the width would be sufficient for king studs and trimmer studs on the sides. What should I plan for the increase in height needed? I wasn't sure concrete opening height even made sense in this context. Does it still require a 2x6 pressure treated header ? So maybe I should add 5 1/2 " perhaps to the height ? Making the masonry opening to spec-out 50 1/2" wide by 88" high ?