[aotte1]

You could make a new one by welding two together, using currently available ones. Moog master parts book should list them by size. Will try to get a photo of one made that way, should be in a pile on the back 40. Need to do some research, kind of remember some newer Ford parts will work, maybe late 60s or early 70s. Their are other members here who really remember this stuff better.

Found photos, not exactly what you need, however, this is from a stock '64 style steering gear box to a newer Dana 44 front axle '79. The same concept could work for you. The one pictured uses late 70s Ford F-250 parts per member "obijuan". Possible could PM him with your question / best parts to use to make one.