Bontrager one would probably work. I have one, it's a bit chunky but does the job fine if you torque the bolts up.
Is it supposed to be clamped on the back of the rails? If so it might be tricky to fit them as the plate on the back is pretty chunky itself...
@Breso started
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Bontrager one would probably work. I have one, it's a bit chunky but does the job fine if you torque the bolts up.