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allsop
Yes, ask the manufacturer. Responsible ones will already have marked the differentiating parts with the rail size they fit 🙂
For designs which don't work with both 7mm round and 7×9 oval rails, it should be pretty obvious at assembly whether your rails match your clamp.
What torque did you use once you'd decided the manufacturer didn't know what they were talking about? What the thread size of the fastener?