Upper control arm bushing extra part?

The Valiant patrol car had the sleeves on all four bushings when I took the original front end apart after the lower control arms broke free in the "K" member and started moving around. At the time I was working at a dealership and the parts person identified them for "severe service" vehicles for what ever that's worth. The '66 273 2bbl Barracuda I'm working on now, which was mostly untouched original, had them only on the rear bushing (when looking at the wheel). Besides the Patrol car it's the only other car I've ever seen them on. Necessary, I don't think so. But if you are into carving up corners I'd consider using them. Certainly no harm in using them.