Actually, if you want complete spark suppression, you need TWO capacitors per flipper: one for the cabinet flipper button switch and one for the flipper assembly's EOS switch.
Here is the correct .1 uf @ 500 volt ceramic disc capacitor for the flipper button switch:
https://www.marcospecialties.com/pinball-parts/C.1M500VR
Here is the correct 2.2 uf @ 250 volt axial mylar (a.k.a. polyester) capacitor for the EOS switch:
https://www.marcospecialties.com/pinball-parts/C2.2M250VA-NP