I have a 1985 Jaguar XJ6.  It has the original-style Jag IRS, which was used from the 60's through the 80's and 90's, depending on the car.  I am going to drop the rear cage out to change the calipers (one is seized) and I wanted to replace all of the rubber wear-parts/bushings while I was at it.  Are there any stiffer and sturdier cage mounts that I can buy - the mounts that connect the IRS cage to the body?

Some of my bushings on the front of the car have gone to polyurethane and I like the crisper, more connected feel.  I want to get the same feel on the back of the car, but I do not want to mount the cage directly to the frame with no bushings.

Thanks! -Dave