Decision: 5x4 (SBP) or 5x4.5?

stock steel wheels...15x6 205 65 front 15x8-1/2.. 275 60 stickymickeys 80 F discs 10.87" and 11x2.5 from 74 B.
no rubbing, no clearance issues, brakes excellent.
Back in the 70's-80's I always upsized tires/wheels to 15".
Factory never seemed to fill out the wheel opening.

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