There's someone on the Suzuki GS repair forum that sells all the o-rings needed to rebuild your carburetor rack, this ad appears to do the same for the XS. Now if someone would include shaft seals, bowl gaskets, viton tipped float needles and those rubber plugs we'd be all set!
https://www.ebay.com/itm/293416947165
https://www.ebay.com/itm/293416947165
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