Notched rear end & wheel width

[roofingbloke]

Just started measuring my rear wheels, i have a 63 long fleet, will be on bags in spring location, with a small step notch,

Whilst measuring for the clearence issues i have noticed that when aired out the rear wheels will hit the joint that steps in on the outer upper fleetside area where the two join with a 1 " joint near the upper area of the wheel tub, (where the fleetside body rolls inwards)

I was hoping to go with 20 x 9.5" or 18 x 11"

I have a stock width axle,

Anyone else got over this situation,

PS; i like deep dish wheels that are close to the wheel arch,

Thanks