still, it makes you wonder, who's manufacturing vs who's just brokering. to Konig's credit, they're not throwing out a bad guess or misrepresenting.
Even if you are manufacturing/own your facilities versus "distributing" you're still not going to get finished cast samples of every option before production. I'm sure manufacturing makes test casts for each mold to ensure processes and finishes, and that's where estimated weights would come from. You can run with those weights, or you can estimate and update once you have the wheel in house.