I bought genuine Suzuki parts to rebuild the carbs, and the o-ring for the float valve assembly seat seems to be larger than the one already installed. The Suzuki dealership ordered another set from Suzuki for me, and they are the same size as the first batch.
My customer record at the shop shows I purchased the same part number six years ago, and the parts I received then are currently installed on the assembly, see the attached photo.
The part number seems to be correct as item #21 in the parts list.
http://www.mickhone.com.au/partFinder/fiche/suzuki/2000/gsf250v/carburetorThe photos in this ad seem to be the same size, compared to the bar code printed on the sachet.
https://www.ebay.com.au/itm/202722106367I am reluctant to cut off the currently installed o-rings in case the new ones are too large to reassemble the float valves.
Any ideas? Thanks.