The old lenses nose piece is slightly longer. It won't lock in with the SI style lenses that has the holes to accommodate the cuts in the new lenses. Aftermarket may be the best bet or taking a chance on one of the new kits as I am not sure customer service would have an accurate answer. Here are some sample pics of the SI style piece on the new BD lens as well as an old school Pro M-frame piece on the new lens.The collector mumbo lenses resemble the mounting points of the ballistic 2.0 lenses, not the regular m-frame lens... have you tried fitting the new gen nose piece onto one of those lenses?