After many hours (days) of searching, I finally found a replacement blade for the old Sears 38" deck.
The old number was 2464R and are N/A. After measuring the blades And more searching I found the Oregon 95-013 blade was the same style.
I ordered a set and they just came in. My father called to say they look exactly the same and fit right on the adapter. So I'll go check them out tomorrow.
I ordered them from here, but I am sure you can find them in other places.
I hope this helps.