I just received some Jaksa o-rings from ISC and here are the dimensions of the 3 o-rings in question 1 10mm ID 1mm cross section Viton
2 9mm ID 1.5mm cross section Viton
The latter you need 2 of for the magnetic coil, I hope this helps for you guys on the other side of the pond. As far as getting them from ISC it is an e-mail and maybe a phone call away.
Gabe
