I have tried Jeg's and a general web sweep, and came up with virtually nothing on driveshafts.  All I could find is a company who fabricates custom driveshafts, and I don't even want to know how much that bill runs.  This leads Me to question: what to do if You ever damage your driveshaft?  

there are hundreds of drive shaft shops scattered across the country...

try google map...  do your own zip code...  then click on the find businesses...  search for driveshafts.....

most have a lathe...and a balancer... along with the presses and hammers...


if you ends are torn up but the tube is straight... they can cut the end off on the lathe and press in a replacement end and weld it in...

if the tube is bent... they can use your ends... again trimming the weld off in a lathe.. pressing them into a fresh driveshaft tube or a longer driveshaft that was cut down to match...

or they can put all new ends and tube and use your yoke..    new joints...

so many options....

the important thing is to grease it before you install it...  since most of the time that is the installers  duty...    the rear joint sometimes needs to be greased before it is bolted in...     use a C clamp or a bit pair of channel locks  to hold the loose caps in while you are pumping  the grease in...

if the cups fall off..  have a look inside...  make sure the needle bearings did not fall over...    that happens once in while when you loose a cap....

oh.....    and please  wipe off the tip of the grease gun... you really don't want to pump dirt into the joint..