I made the pistons that are in my car and they have been working realy well. I can make the ones in that link but am just curious to what the advantage is with having an oring expand to the shock body wall. It just seems like you would always have a rough time with oil choice. I could be wrong, it just seems to me that the compression and rebound dampening would be extremely different. And possibly even lock up the shocks on bigger jumps when landing. They may work great and i may be way off, just would like some feedback before making them.