As a chemist, I thought I should mention that low spring temperatures might throw off your otherwise well-intentioned bottom air searches. At lower temperatures, the top air might experience some shrinkage, and contaminate your otherwise perfectly good used bottom air.
I'd really suggest you pony up the big bucks and go for quality Genuine Honda bottom air, as it's generally guaranteed to have a logo. Then again, with the Honda font download recently being offered for download, those pesky countefeiters might now be passing off fake Honda bottom air. I'm lucky that my Honda dealership is obviously using real Honda parts, as everything is at least twice the price of OEM. It's just really hard to see the Honda logo on the edge of those 40$/each carb gaskets.
Anyhow, good luck with that bottom air. I'm lucky that mine hasn't yet escaped.
Francis