Need help with OEM Bed Extender

Looking for someone with an OEM Bed Extender to take a measurement for me.

I need a measurement from the bed extender to the side of the bed as the extender is being rotated up out of the bed onto the tailgate.

I have a Access Cover roll up tonneau & the mounting rails for it stick into the bed a little. Wanting to make sure the extender will function properly and not hit the rails.

Thanks