Anne, Does you Cub have the extra upper cabin cross brace? I can't remember if it does, but if it's there, and has the small bar across the rear of the brace, this is the best place to mount the front harness. Wag makes good basic belts. I make my own mounts though, Wag mounts suck. Atlee mounts are better. Certified or not, get good belts that are installed properly. If the mounts are weak or not structurely correct, they are not worth having.
Digglers Am Safe 84 month thing is interesting. Does this mean I can't sign off a annual on a plane with Am Safe belts over 84 months old in it? Looks that way. Another heart warming case of a big company passing off the liability for their product onto the little guy. I hope people boycott their product, and their own legal back-handedness slits their own fiancial throat. I've never had good luck with inertia reels, Am Safe, Pacific Scientific, or whoever makes them, the centrifical ratchet always wears out fast when used a lot, (i.e., in a plane that actually flies instead of sitting in a hanger). In some aircraft where controls are hard to reach, they are worth the maintenance aggrivation. But in a Super Cub, everything is right at hand, (I've never had to loosen a rigid belt to reach the flap lever, and I don't think I have freakishly long arms). And when things get really hairy, the reasuring tug across the shoulders of a rigged harness sure feels good.