Rocker arms that clear larger diameter springs

I think that was self explanatory.
Could you point out springs wider than 1.5 for me please?

Almost any spring for a solid roller (spring pressures over 500lbs open) will be wider than 1.5. An example of a typical solid roller spring, comp 943's.....1.55" diameter, ~240lbs on the seat set up @ 1.90", ~ 600lbs open.