Before being too harsh you must realize there are many different "Kentucky Pistols" ranging from originals to those imported by Traditions, CVA, Lyman, Pedersoli and several other companies.
The parts for these are all different and cannot usually be substituted for a similar part in another make of gun.
More to the point, CVA no longer imports pistols from Ardesa (the maker in Spain) and the best source of parts is Deer Creek in Indiana.
They do not have a web site so you must call or write to them.
Deer Creek Products
6989 E Michigan Rd
Waldron, IN 46182
(765) 525-6181
If they do not have the parts you need you can try contacting Traditions.
Traditions is the current importer of the Ardesa guns.