CZ-75, or CZ-75B? There is a subtle difference.
For either gun, springs are availble from Wolff.
The new model slide stop and extractor work in the older guns.
Recoil springs don't break, neither do extractor springs -- they do begin to function less well. Extractors may eventually wear, but you'll likely know before the gun fails.
The older model doesn't have a firing pin retention roll pin. And I've not heard of one of the "doubled" pins breaking. If you don't have a "doubled" pin installed in your newer B model, and it breaks, you can fabricate one (with a Dremel) from a roll pin available at your local hardware store. Cost?
Mine cost me $.15.
Except for a strange little spring inside certain of the older (pre-B Model) 75 safeties, most of the new parts work in the older guns. (Hammer widths changed over time, so they are NOT all interchangeable.)
You can get quick turnaround from CZ-USA.
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Keep on hand those things you can't wait a week or so to get directly from CZ.
Slide stop, maybe?
one doubled-roll pin, maybe?
For sure, get an upgraded (extra power) extractor spring from Wolff. (Its a new part, and its an immediate upgrade, not a "replace when the other wears out" sort of change.)