You need a 2-rivet bayonet scabbard for McClellan's Bodyguard.  That 7 or 8 rivet scabbard you've always had?  Its probably sutler row junk and that style is not appropraite for 1862 impressions anyway.  Grab this excellent reproduction of the most versatile style of U.S. bayonet scabbard made by L.D. Haning.