I may have answered my own query. Although the Z1300 parts diagrams don't list the float valve O ring seperately, a bit of goggling and found part number 92055-1101 Float Needle Valve 7.5mm x 1.5mm, listed for a heap of multi cylinder Kawasaki's although not Z1300. But almost certainly same O ring. I'm thinking Kawboy's original post on this might have had a typo and indeed should be 7.5mm inside diameter. Back to the seal shop.
Yes, you are correct. My mistake. the o-rings are 7.5mm inside diameter x 1.5mm cross section. Having moderator rights, I went back in and corrected the information post on page 4.
Good catch by you.
Usually the sizing of parts are referenced from the O.D. but for some reason o-rings are sized by the I.D. ??? Why can't they stick to a standard??
When I bought these o-rings from High Tech Seals my bill of sale referred to them as MV8 which is a 8mm x 1mm o-ring looking at the charts that's 8mm I.D. x 1mm cross section.
For info purposes-
standard o-ring compression is 10% so on an o-ring with a cross section of 1.5mm, 10% would be .15mm (.006") , meaning that the diameter of the valve needle seat should be .3mm (.012") less than the measured diameter of the o-ring as mounted on the needle seat. This is all you really need to know when selecting an o-ring. Just remember 10% compression.