Here we have a Universal P/S fluid that works fine, and many manufactures make Type F, Exxon, Mobil, Havoline etc, and I believe Mercon H replaces Type F.
Try calling Auto Parts Stores they might have a replacement listed under another name. Ford Type F is used by Austin-Morris, Diahatsu, Jaguar, Mazda, Rover, Saab, Toyota, and John Deere hydrostatic systems.
Hope this helps. Vern