I've been looking for the Gold & Blue Seal-Ribbon which is a foil over paper sticker (as mentioned above). I had contacted TM a while ago with no answer. From some bars that I've seen for sale, it appears the foil "Seal of Performance" is the earlier (early to late '60s?). I've seen a set of bolt-on at the rear spring plate (3-point) with the foil seal vs. a weld-on set that had the yellow & blue sticker. The Weld-on set was a '67+ application. There does appear to be some overlap which makes it confusing. Would like to get one foil sticker (they only put it on one bar). Some of their ads/decals say "with Gold Seal".
Paul