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It's hard to get non-metric screws/bolts here. I converted the imperial units to the standard metric units. Maybe Allted can put the list with the metric units to the instructions.
The 608z are sold with an 8mm inner diameter, so "M8 Schrauben mit Schaft" should be what you called "rough bolt" and should fit with the 608z. I'll post as soon as the 608 arrive here :)