While this may not answer your question, I'll add my experience. Back in 2011 I got my PS rack from Breeze which were rebuilt racks. My rack required 'O' rings. I installed the rack and later when I went to hook up my lines I noticed that the rebuilders, when painting the rack, had gotten some paint in the tapered section where the 'O' ring needed to seal on more than one spot. I preceded to use some dental tools I had and slowly removed the paint, little piece by little piece followed with some real fine abrasive paper to finish up. I had the ports plugged up with some paper towels to keep debris out. This was done from under the car while the rack was mounted on the chassis.

Long story short, no leaks.....at the PS ports anyway. I did have one small leak at the reservoir, but that was my fault, and it only required some tightening.

George