I also have the old arms that I will give you but are rusty. Three years ago I purchased a new driveshaft and the rake arms. I also have the old arms in case you bend any. Early 1990's used Galfre rotary rake model AG 350/10 with new driveshaft and arms.
This rotary rake produces large, well-formed windrows that promote faster drying, allowing you to harvest your crops at their peak nutritional value with less reliance on the weather.