Your best bet is to find a Swagelok dealer, and get their big full line catalog, the one in the white binder.
What most of us think of as Swagelok is actually a group of several interrelated companies including Whitey and Nupro (valves) and Cajon (ordinary NPT-type fittings). The Swagelok name technically covers only the self-swaging tube fitting family.
Swagelok is NOT related to Parker. Parker, like several other companies, makes a line of fittings and valves almost identical to the out-of-patent Swagelok items that can often be had for much less, and Swagelok warns buyers frequently in its publications to beware of imitations. MacMaster Carr carries the Parker clones, not real Swagelok.
Swagelok stuff does not come cheap, but there's a busy thieves' market of used and surplus Swagelok and similar items on Ebay, where some very good deals can be had, though you really need a the catalog to know what you are getting.