Exhaust rubbing my springs
 

I recently installed lowering springs and in having the problem of the exhaust rubbing the back right spring, it only happens when there's more than one person in the car but it's a horrible sound when I have a passenger, I'm worried about it eventually rubbing a hole in my exhaust, is there anything I can put between the spring and the exhaust that won't catch fire or melt that will stop this from happening