Does anyone know what size the thread sealing o-ring to use for these fittings?

I did find this assembly guide from Voss that shows reusing fittings by leaving them on the tube and unscrewing from the component. I think this is the same fitting type the LR3 has. I couldn't find any dimensions on the o-ring.

https://www.voss-automotive.net/file...structions.pdf

Maybe I should just buy a massive o-ring assortment to keep on hand

 

I'm new here so please be gentle. I found this in one of the manuals:

 

Replacing the fitting is definitely the proper procedure but I think you are also supposed to cut back the tubing and you can only this so many times before it adds extra stress at the joints. I haven't tried this myself but a new fitting on the old tubing might work just fine.

I was hoping to find the replacement o-ring because it would be marginally better than just screwing the fittings back in without replacing any o-rings.

This Voss document seems to be for the right type of fitting and they show on pg. 13 unscrewing and reconnecting the fittings. Granted, this is probably written for factory techs and might not apply to stuff that has been in service for 15-20 years.