@ScubaSamScubaStevesFather,Is this the o2 conversion/rebuild kit? SCUBAPRO MK-5 or MK-10 Viton Rebuild Kit 27 pieces including H.P. Seats, Filter. | eBay
The kit I used I purchased new ca. 1994. I remember mine being packaged in a small, Scubapro-badged, Ziploc-type bag, and being specifically for the Mk 10. I remember it having fewer pieces than the kit you've linked--because mine was for only the Mk 10. I purchased my kit from my (then) LDS, a Scubapro shop.
I used that Mk 10 for eight or so years after I did the O2 conversion, disassembling and cleaning it for oxygen service annually, but not replacing anything. It has sat unused ever since I stopped technical diving (ca. 2002) shortly after I had my first child.
rx7diver