If you note carefully the 577 receiver clamps at the ends on the static side- too short a top plate may not engage properly carousing misalignment On the plate .
In reality sawing a 501 in half is ok in light load situations
Thank you Bern, but those kamerar quick release clamp is off center. Looking for one in the center.
@morgan_moore - I was considering cutting it in half, but the plates I have, have a long center slot for the screws, which would make the plate possibly prone to bending as it will only have a small section connecting to each side.