I had a similar problem with my '79 several years ago. I used standard plumbing fittings to fix the problem. I don't remember the exact sizes, but here is what I did. I tapped the outlet hole (1/2" pipe I think), screwed in a street elbow with 3/4 " (maybe 1'') female outlet, screwed in a short nipple, and attached the water hose to the nipple. Have had no problems in years.
As I said, I don't remember the thread sizes, but you can inspect/measure the outlet hole in the head and the hose size and select the appropriate elbow and nipple. I would suggest using brass fittings and Permatex the threads.
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