The aluminum bits in these are eminently adaptable to pre-war Schwinn with a little creativity (like welding in a rear hoop to contain them) and they'll sell you just the inserts separately if you don't want the whole kit for about half price... at least they were willing to do so a year o so ago
A while back I bought the whole set, and the castings themselves are thick enough that my plan was to slot them (would be along the plane that makes up your monitor screen) and trim off most of the OG dropout into a C-shape and insert it as a stub then have it welded up... if your frame wasn't crimped like a Schwinn you could install as they were intended by just snipping the tube. Not the cheapest solution in the world, but certainly easy, and lets you swap between 650B/29er or 650b/26" set ups at will depending which wheels you get the better deal on and how you initially weld them in.
(Manhattan aero) its a modern steal frame ..
