83 ur-q brake servo rebuild questions

[spectrum]

Hi gang,
 
I'm hoping this will be a quick one, but I think I know better...
 
I'm looking for information on a rebuild for the hydraulic brake servo on an '83 ur-q.
I've seen a pictures and a procedure on the rebuild but I'm not finding information like part numbers for the seals/o-rings, etc.
 
Also are they're more than one type of servo used based on vintage or vin number?
 
Any btdt?
 
thanks,
 
todd c