The seals in the end-caps, and the o-rings on the outside of the end-caps are the only ones that matter. You can reuse the others if they look OK. That's because most people have the damper set to it's lowest damping setting, so internal leakage is unimportant. What is important is assembly with no air bubbles, and no external leaks.
Watch the orientation of the seals in the end caps.
Oh, and if you take the mount block off to paint the body (a wood.wedge will open the block enough) then measure it's location. If you try to slide the block as you install it, you damage your nice paint. I know someone with the same name as me did that.