restoring bucket seat sliders

So I took my sliders apart today and as advertised it was just a matter of straightening the bent over corners.
I have a follow-up question - the grease in these things is like molasses - sticky nasty stuff (just like described in the video). What was originally used to grease these things and is there a good substitute that is easier to work with?
By the way I'm on the hunt for a source for the little cages that hold the ball bearings and cradle the roller. All the bearings and rollers are in good shape but twp of the 8 holders were really mangled and would best be replaced. If somebody wants to save me an hour on the interweb because they know where to get them, please let me know.