Hi,
I have a "guibo joint" that we no longer use, i will be happy to sell it to you if you p.m. me your address. It is very nearly new, these joints became obsolete from ford some years ago the last ones we got were from our local transmission/drivetrain supplier who had bought all the stock from our local dealership. The other solution we used when we ran the 4x4 mt75 box was to fit a normal drive flange, the flange is off a transit early type then have the front end of the prop modified and lengthened with a matching flange, obviously there is no cushioning effect but it did'nt seem to effect anything.
Hope this helps
Regards
Ian