1970 window openers

Without seeing the operator out of the window with the hole pattern on the top and bottom tabs clearly displayed, I am afraid I can't say what you need. It might be the 39-054, but you'll need to compare the dimensions to confirm. 

Unfortunately, we don't sell replacement hardware for these old garden windows. I don't believe they're even made anymore. Your best bet is a local hardware store that might service homes in the area. It's not a guarantee but they may have older parts in stock you can use. Note that I'm not talking about big box stores, but more like a local mom and pop establishment.