I just finished the conversion. I ordered all the parts from Rock auto. $140.00 shipped to my door for a 2003 Yukon xl 1500. 2 Gabriel shocks #61675,1 set of Moog 81071 springs and 4 insulators # Moog K160072. It took about 2 hours and it rides perfect. I do not tow so the 81071 springs are great and restored the nice ride the yukon is known for.. I did not need a spring compressor and it took a little muscle to get the new springs in but it is doable. Trick #1 is to install the isolators first I used a dead blow hammer on the bottoms and the tops will hold themselves on to the upper locations. Warning #1 watch the center brake line attached to the top of the differential as it will be at its max length and if you pull to hard you may damage it. Other than that it was pretty easy. I like the ride better than the Nivomats. And the price of 2 nivomats Vs this conversion is a no brainer.