There was 2 kits. The one for the Piston
0005891723 Piston Vacuum Pump Kit Piston end.
And there was another for the inside parts that included the Arm and Bearing.
When the kits were available both of them cost more then a New Vacuum Pump and if you rebuild the Pump yourself there is no warranty.
My question
What in particular causes vacuum pump failure?
http://www.peachparts.com/shopforum/diesel-discussion/204187-what-particular-causes-vacuum-pump-failure.html
Vacuum Pumps destroyed timer Bushing Identified as the problem
http://www.mbca.org/forum/2013-12-29/why-are-these-vacuum-pumps-being-destroyed
Repeat broke new vacuum pump
http://www.peachparts.com/shopforum/showthread.php?t=258062&highlight=vacuum