On the 2 I have put together , I flattened those areas before bolting the wing extenders on ...
I am not surprised that the rollcage doesn't fit every car every time without a bit of fettling ...a fully welded rollbar , no matter how its welded will want to move whilst its bolted to its jig , if you weld a bit of tube , as you roll around it , you can see it move due to heat ...when you release them from the jig , sometimes they will 'spring' a little ..add into the equation repaired cars , pattern panels , slightly twisted cars etc etc ....and things will often be slightly misaligned .. opening up some holes a little or forcing or relieving it with a grinder will compensate for the slight irregularities
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