Billy,
I you are wondering about recoil springs, have no fear. You can substitute a Glock G19 recoil spring. They are a perfect fit. I use a 22# in my 9mm and a 24# in my 40 S&W CZ100's. I also use an AroTec S/S G19 guide rod, also a perfect fit.
As for spare parts, I would look at the parts diagram and order one of each spring and one each of every pin. Personally, I am not too worried since they are built like tanks and besides, I have two. If I see another at a good price I may pick up a third.
The only maker of magazines other than CZ is ProMag as far as I know. I have used their 40 S&W mags and have had very good luck.
Good shooting.