O Rings for KZ 440 LTD

I am attempting to clean / rebuild my carbs and am looking to buy new o-rings (and maybe new carb boots). I tried a few searches and found full kits (like one linked below) but I would like to try and reuse my existing brass. Am I overthinking this and should just get the full kit?

www.amazon.com/Carburetor-Repair-Kit-Eac...982+kawasaki+o+rings

Z1Enterprises.com sells various metric o-rings.
Alternatively, a metric nitrile or viton o-ring kit may have the needed sizes.
I got a kit from harbor-freight & several sizes were either the same or close enough. the old ones were deformed & hard, so it wasn't really possible to say for sure what size they were



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Some o-rings and parts are missing is this carb kit.

www.motorradbay.de/ltd440__cv32-kk-0153n...f05578df163a3d8653c2