SRAM PG-1130 cassette manual? Meaning of numbers on spacers that go between sprockets? Took apart the individual sprockets on my SRAM PG-1130 cassette and the spacers (the ones between the cogs) were so dirty I didn't even see the numbers on them but each spacer has an 11 on it (makes sense, 11 speed) as well as another number on it. You'd assume the other number would be a number 1-6 (there are 6 spacers) but they are 2,3,3,5,6,8.

Not trying to overthinking it but I missed some letters on the rear derailleur pulleys when I cleaned them a couple months ago that indicate which way they should face and it caused a lot of noise/shifting problems. I finally came across a YouTube video of a guy breaking it down, SRAM has no user manual for the Apex 1 derailleur. 

SRAM's online user manuals seems ridiculously bad, I never got any with my bike (bought it from a shop who assembled the bike, so that's on them) but feel like you should be able to look up the part number and get the user manual for it but all I could find is this which is super high level and doesn't even cover this specific cassette. Pretty ridiculous.

Also does anyone know if I should grease the spacers when I assemble the cassette? or just on the hub?
Just a guess, but does it align to the number of teeth difference from cog to cog?

That could be approximately correct except for the 36-42.

No, you don't grease the spacers, they are plastic so the will not corrode and seize to any other part.

The spacers will all be the same thickness for any number of cogs (6/7/8/9/10/11/12) as it aligns to the amount the derailleur moves per click.

Using any spacer that varies at all for that number of cogs will result in really poor shifting