Rear shoulder belt anchor point

[californiabristol]

I am trying to reposition the shoulder belt anchor point on the rear belts of my 411. Currently, the re-tractors are located above the fuel tank directly
behind the rear seat positions( i.e. on the parcel shelf). I want to move
the re-tractors outboard so the belt does not fall directly on the neck.

Can anyone tell me if the rear wheel well is a better location to mount the re-tractor? This would be a simple solution provided the wheel well is not
rusted!

Greg Woog