I have a ton of Paterson tanks and reels, all of it the Super System, but not the SS4. These are the ones with the gray caps.
Please PM me if you need anything and I'll get back to you. I was planning on selling this all in parts, so if you just need a new O-ring (and who doesn't need a new O-ring?) or the spindle or anything, let me know.
I have two tanks that will hold two reels at the 35mm setting or one at 120 (with the spindles), and one tank that will hold three 120 reels (without the spindle, unfortunately). Tons of reels and lids.