The three slave cylinders pictured Left to right are ls1, ls7, and viper. I just reused the viper one because the bolts lined up with the viper t56 faceplate and it was the same measurements compressed and extended as the ls7 slave cylinder. The hardest part is getting the input shaft in. I paid bob hanlon motorsports to do it. You also need a shifter, I believe the viper one is offset left and forward. I used an mgw shifter for the adjustability and had to cut a new hole in my trans tunnel.