I have Koni reds and 200lb springs and I would like to add adjustable perches. My search led me to Coleman racing, but I can't figure out which kit is correct.

5" Coil-Over Kit (2.04 I.D.) $42.75
5" Coil-Over Kit (2.08 I.D.) $42.75
7" Coil-Over Kit (2.04 I.D.) $42.75
7" Coil-Over Kit (2.08 I.D.) $42.75
8" Coil-Over Kit (2.04 I.D.) $42.75
8" Coil-Over Kit (2.08 I.D.) $42.75
I measured from the center of my shock bolt to the base where the springs rests under a load and that meaurement is 8 inches. I would like to be able to drop the rear height about 1-1.5 inches.

Do I have to remove a shock to measure it's diameter? Also, don't quite understand what the 5, 7, or 8" option refers to...unless its the 8 inches that I measured. If so do you buy a shorter length to drop height or go with the same measurement?
Thanks

The coleman adjustable perch works like this.
Remove the existing spring.
Remove the existing perch.
Buy the threaded collar, clamp nut etc.
Buy the 8 inch springs 2.5 inch diameter.
The threaded perch slides down over the adjustable spring perch clip.
the lock two nuts go on the threaded perch.
The spring goes over that and sits on the two nuts.

The nuts are pinch nuts so when you adjust it to the proper height you jam nut them together.

Rich