tapered or flat washer

I replaced the washers and seats in the standard hot and cold shower handles in a thirty year old house. I used 3/8" flat washers I already had. I also had some tapered washers. Does anyone know which to use in this situation? The old washers were so badly torn up they might have been either.
Thanks
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If you used the flat, did they work? The tapered are sometimes substituted when you have a chewed up seat, not your case since you also replaced the seats. IIRC some seats may require a tapered too. Not too sure about that one. Go with what works.

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According to the owner of a local supply shop, all washered faucets leave the factory with flat washers. Most plumbers replace bad washers with flat.
Colbyt
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Either will work but I've always found tapered to last longer and to have a better "feel". They seem to be more forgiving of any imperfections.
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