I bought a radiator for my 78 MGB and it came (used) in good shape. As I put it in the car to see how it fit, I noticed a hole under the overflow tube outlet. What should go in there? I have the part out in the car so I can't post pictures tonight. If any one has a picture to share please let me know. I have a good buy in the radiator business so if it is missing a fitting I can have him put one in.