Are there any commercially available pieces which can be used with/for coilover sleeve kits to keep the rear springs from rattling when the rear wheel lifts or goes airborne?
If not, do you guys have any suggestions? TIA

 

ya, don't get the rear of your car airborne.

 

Ya, looks like I'll need more front bar!
I keep lifting the rear inside corner.

 

Use some nylon ties around the top of the spring and the upper perch. I did it with my abx coil-over, and it works just fine.