So, the description says to use the 4 core mounts. I was looking in the questions and someone says use the 3 core and trim. Which one is it and are they in stock? Thanks

The 4 row mounts are it. The radiator is thicker than stock. Also, the stock, or 3 row mounts can be trimmed to fit, in a pinch. 4 row mounts fit perfect. It is best to call to check current stock.