Re: Measuring for Track Wheels
I don't think it would fit,
With 5 inch backspacing you have the rest of the rim (5 inches) sticking out from the mounting surface, but you only measured 4 3/4 inches, and then you still need room for tire
However if your rear end is really high up there with lots of clearance above the tire you might not have a problem.
And back spacing is the measure from the back of the rim to the mounting surface so more backspacing would put the rim further under the car.
Is that a fuel line running through your wheel well?
And a side note, 20 inch rims and you still have drums...