Last year a built a 400m for my 78 bronco. when i got my block back from the machine shop they had forgot to put the hose connecting end back in the hole where the coolant comes out of the block for the A/C compressor. This hole is on the front passenger side of the block and does not have threads in it. I tried very long to find the right part but never did, so i used a metal hose end from an old gas tank and hammered it on there and put RTV all around it. Needless to say, it has now started leaking and i would like to fix it right this time. Does anyone know what this part is?