I took the measurements from my case and went to Autozone and looked through the back of their heater core book where everything is listed by dimensions. Keep in mind the in and out tubing sizes and the direction they go. Mine is a number39-9025 and its core measures7 3/4x6x2 and it has 5/8 hose inlet and outlet. Which really is 1/2 copper pipe easy to get fittings to sweat on to adapt.