There may be some minor differences betwixt Pietta, Uberi, ASM, etc, internal parts but
One can get complete Pietta parts kits from Cabelas:
http://tinyurl.com/BPpartsone can select "NAVY" parts which will fit all the Pietta Colt's such as 1851, 1860, 1862 regardless of .36 or .44
or one can select REMINGTON which fit the Pietta Remington 1858 .36 and .44
the kits are the same I was supplied by Dixie about 2 years ago.
yhs
prof marvel