Finish Front Suspension / DS Footbox

Today I slipped the modified lower DS shock mount spacer in and finished tightening up the DS front suspension and brakes.  I also took off the sheet metal on the DS footbox.  Marked and took photos of everything for documentation.

 Looked online at 15" wheels and am trying to figure out the rear end that I would like on the car.  Should I sell the 17" and go to a 15" wheel with larger sidewalls?  I like the look better.  And if I can stay with the rear axle width that I have, it would save money.  I just need to make sure that they would fit.