The Scale Detail Engineering RR10 Bomber Headers mount between the existing shock towers by using longer hardware. We recomend the same course plastic self tapping screws that are used in other parts of the Bomber chassis.
Standard M3 machine screws work fine, just keep in mind these are not threaded.
This Scale Detail is a set of traditional headers like many 1:1 rigs, a set of 4 into 1 pipes (from the shock tower mount) and end up as 1 at the Bomber battery tray.