My wife was complaining the seat was too low.
So I looked around & saw the "fix" on another forum.
Granted I think I may have went a little too high with 2"x2" square tube.
I think 1.5" x 1.5" would be a better idea.
I like using the tube with stock bolts to make it seamlessly reversible vs. the other method of cutting off the bolts that are spot welded to the frame then bolted to the seats and using new bolts with spacers.
This way uses the stock bolts/nut on the bottom side, then a new 3/4" long set of bolts to bolt the seat to the square tube.