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You're right that measuring orings is a little tricky. The cross section was the easier part to measure. Just check in a few places, keeping in mind that an old oring is probably squished in one dimension.
For the diameter, the large oring that is the diameter of the pump body is the harder one to measure. You can put it on a flat surface and do your best to measure a few different places circumferentially while taking care to not distort/compress the oring while measuring.
Doing those two things got me close enough to figure out which size orings I needed. It may also be possible to measure the groove in the pump where the oring goes to validate your measurements.
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