Are mustang spring isolators a 1 time use only, or are they re-usable on a new 2010 car...if they are re-usable how many times can u re-use them?...

 

If you're talking about the rubber pieces that isolate the springs from the chassis, there is no limit on the number of times you could re-use them. If they're torn, etc. then replace them, but I can't see that being an issue for a new car.

 

Completely reusable as Phil just said.