The flexibility is going to be a big issue. The diaphrams on most car carbs is used to simply pull the choke or some other mechanism open under vacuum. They are either full open or full closed for the most part. The slider diaphrams have to meter the fuel, so if it is too stiff, they are not going to open up enough and the engine is not going to get the right fuel mixture for a certain condition. The same thing will happen if they are too thin. They will open up too far and cause problems. That is one of the reasons that they are so expensive.
You could try and cross reference the carbs on that bike and see what other models use the same ones. Then you could scour ebay for those models as well. I do not know what models have the same ones, but maybe someone on here does. Or maybe a dealer could help you find that info?
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