Will they fit?

[slugish]

Anybody running 4 in backspacing on their 8 in front rims for lowered truck < If so what size tire.
Ipresently am running 8in tt2's on front -5.5 backspacing - 255x 17x 50 tires & still have room to go wider. Ialso have 2 -9.5 in. tt2's with 5.5 backspacing laying around in my garage I WAS PLANNING ON SELLING .
Question is this : If some of you are running 8 in rims on front with 4 in backspacing , would not 9.5 in rims with 5.5 backspacing work the same . Unless Im thinking wrong ( which Ido a lot ) they should stick out about the same .