If you need to make a stablizer bar a bit wider to match longer LCA`s You can heat the front bends with gas torch until only very dull red and bend them out to suit the greater width requirement. while the bend is still very hot dip it into a tub of oil(used sump oil is fine) to re temper the bar.
I have done this several times on front bars for improved production racing and had no problems. (The cars are front runners and have had the bars on for years)

Simon.

EDIT. Hint: Mark out with chalk on your shed foor the shape you need the bar to be and use this as your template when bending.