Well, Cisco does not really have catalogs for parts, and that is because when something goes wrong with the switch, router, etc.. you just RMA it and get a new one back. This of course require a valid service contract but if there is no contract (Like when you purchase from eBAY) than it is a risk you take. Some vendors provide warranty on the parts they sale, so you can exchange or return it if it is incompatible.
HTH
