I remembered. The Cub Crafters is SA92 NW, and its Flight Manual supplement is CR 101000-5, rev E (2004).
Almost everything in the AFM supplment is also stated in the STC. Normal category, restricted to 1750 gross, two Sensenich and one McCauley props approved. Avoid 2150-2300 RPM with metal prop and hollow crank. Normal Lyc oil instrument markings. Placard required on fuel selector and both tanks.
I had not looked at the weight and balance since the conversion was done, since CC did the weighing. Aircaft weighed in at 1507#. I need to check what CC says is the max - the aircraft has the 2000# kit, but it has to be approved with the CC STC, by the installer. Without that, the useful load is 243 lbs. with it it is 493lbs, or just about the same as a J-3.
That last paragraph is just fyi - has not much to do with anything. I am willing to bet the darn thing cannot be flown within the cg envelope. There is another Cub hereabouts without the 2000# kit, and an empty weight of almost 1300#.
If I get a Super Cub, it will be a stock PA-18-95. I shall skip the mods.