44 Dave Dixie Gun Works
PP1808 Barrel Wedge w/spring for Reproduction Colt 1851 Navy, 1861 Navy, 1860 Army and Original 1851, 1860 & 1861Conv. $10.95
Whether you shim or replace the wedge you should also deal with the arbor length and barrel/cylinder gap.
Yeah I knew about the Uberti short...