It seems you have a Springfield converted Spencer Burncide carbine to Military rifle.the parts you are looking for are different than Spencer parts,the band is off a 1868 trapdoor and the cutoff can be a Springdield made one or a original Burncide one,parts can be obtained from S&S.clean with fine bronze wool an plemty of oil,take your time and it will come op nicely,do not over clean or remove any finish that remains or value will decreas