From the looks of it they look like the 369 u-joints (about $13 each). I do not know if they are greasable or not...
The gray boxes I can not tell what they are...
I personally would of went with the 269's if I was going to buy the Fedral Mogal (Napa brand) as they are a bit stronger. Even than I've heard that they are junk (thats from a fellow Jeeper who works at Napa).
What you have in there now (probally Spicers) are actually probably stronger.
As stated prior I'm a fan of the Spicers. Yes they are more expensive, but they are stronger and trouble free.