Just curious-stumbled across some operator and parts manuals for K&N Model H, 4K, 1H-2H along with parts books and instruction book onBuffalo Iron Workers. All are new and in unused condition. Got any idea of what they're worth? Seen some going for $50 on Ebay in rather nasty shape but don't know if they get sold for those prices. Any comments? Suggestions before I Ebay them?