shock o-rings... where to get them?

[Monkeysmate]

Morning!
I need to replace the seals on some big-bore shocks and was wondering whether there is a source of o-rings that doesn't involve buying the kit TU0250-8?

The kit seems strange in that it only has 4 of 9x1 o-rings, when the manual says you need 8 of them??

Any advice?

Thank you