I included the Service Kit in my original order and I'm grateful to have the spare o-rings ready to go if one of them fails (in fact, I suspect that at least one of the piston o-rings in my CJ has been faulty from the beginning) but do we have access to a list of accurate specifications for each model of o-ring in the CJ?
The option to just buy generic replacements from any number of suppliers would be much more convenient than having to always buy proprietary models from CJ. Apologies if I've missed an FAQ entry or similar helpful info.
Update: as far as I can tell from my repeated and hopefully finally successful servicing of my CJ, the O-rings were not the problem.
The FAQ does contain a statement regarding the proprietary ("bespoke") specs for all the O-rings so generic substitutes are officially not recommended.