The flex joint I got many years ago and the guy's name started with a "Z" is all I can remember? Here is what one looks like:
Fortin Sealed U-Joint 1/2" Dia. - Kartek Off-Road and is made by Fortin who also makes sequential transmissions that will pop right into a 914.......for lots of $$$$$$. Search for Fortin parts and that will get you going.