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Those were just plastic clips. There's only 3 actual hardware peices that hold the wing on. 2 bolts on the outside and the one nut on the inside. You shouldn't need a template since the wing contours perfectly with the shape of the hatch. Measure the bolt location on the wing and then transfer the measurement to the hatch. It will be perfect.
can the wing be safely installed with 3 bolts instead of 4? I would rather not have to drill an extra hole into my R1 hatch if not needed
It can!
I had it installed with the 4 bolts and 2 nuts previously. I want it with the 4th clip or whatever that is because the wing will not sit flush with the trunk if it's missing that!