[xk] Spare wheel tub?

As I am working on the bodywork of my FHC, I just discovered the
past owner made and installed the left and right side peices that
hold the spare wheel tub. The problem I have; one is 12 inches deep
[from body to bottom of side] and the other one is 11 inches. There
is no tub with the car, so I will have to make one, but I have no
idea which side is correct [11 or 12 inches]? Does anyone happen to
know if it should be 11 or 12 inches?

Thanks … Harv–
Harv XK 140
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