Try McMaster.com
Macmaster-Carr carries a wide variety of things we can use. Trouble is
YOU are the engineer that decides what material is appropriate.
My impulse is to use stainless. However I am a Microbiologist which
is about as far from engineering as you can get.
They have no minimum charge. However you may need one and have
to buy a package of 6, 10, or 100. I have 99 O-rings from them
The springs in their website are in the bottom section on the right side.
