Ls coil holder designed to hold 4 ls coils sideways. They were made to fit the standard ls2 coil that are flat and square body like the ones found in a corvette not the round body truck coils. The round coils may fit them but I have not tested it. I made this with a flat base so i could graft a custom mount for the bottom to fit my vehicle. This should be printed out of nylon due to under hood temperatures being very high. the motor coolant and engine oil can get to 250 F so that is the minimum temp the print will see so the presence of a exh mani will make it much worse then that. .