1871 Enfield, 1857 tower

[Sask Farmer]

I have come into possesion of a 1857(577 snider calibre) tower in what appears to be a carbine version, the front site is missing, other than that it looks in great shape. The 1871 is a Endfield 3 band rifle which also looks in good shape but the rear site is missing. where would I find these parts for these guns, thanks in advance for any help.

 

[TurtlePhish]

You might have more luck in the blackpowder forum:
http://www.thehighroad.org/forumdisplay.php?f=12