The rads are very similar. TR8 has a bigger hose inlet. TR7 has a push in fan switch, TR8 has a screw in, but I don't use them anyway. Much rather use an aftermarket adjustable fan sensor and an electric fan. TR8 mounts on an angle and the TR7 straight up. Fabrication for the TR7 is actually easier than it is for the TR8, but neither one is difficult. Started using these in my TR8 race car long before anything other than stock was available. I'll be putting one in the TR8 I dragged home last month if it doesn't sell soon the way it sits. If I do, I'll write something up and take pics as I go to show how easy it is.