From what I've seen and been told.... the 4/2 shock is not available now and may never be. Thats a #4 compression and #2 rebound. Bilsteins are roughly 3/3. These are basically Afco series 16 shocks
https://www.speedwaymotors.com/AFCO-16-Series-Custom-Racing-Shock,65922.html The top screws off. There's only a sticker on the screw off cap which will be worn off by the spring anyway. I'm guessing that these will be apart and custom valved immediately by some. They are going to very difficult if not impossible to police. And I don't think this is going to be a small advantage. I'm afraid that its going be turned into a slighly lower cost version of penske super late shocks. I would have rather stayed with Bilstein or a similar welded, sealed, non take apart shock.