I've never dismantled a rack. The one time I needed to, I bought a rebuilt rack. That's EASIER, because you still have to R&R the rack from the car either way. Cost vs. extra few hours of your labor is your call.

If you choose to rebuild yours, there's always the risk that you take it apart & find the REAL problem is the bore inside the main body (#11) is all buggered up, rough, pitted.

BTW, when I said 'not supposed to be fluid inside that boot' I meant it is not supposed to be full. Some few drops or puddles inside there, you can use your judgement. On my bad rack ('89 Saab) I lost about a pint of fluid. No leaks on the ground because it sorta FILLED up that boot.