Thanks for the reply Mike,
Yes I do mean the roll over bar not the cage, I'd forgotton they did a cage for them.
I didn't mean adjustable wings, what I meant was how much adjustment is in them when they are put on. Mine are bolt on too, however I am assuming that with either a bit of filing, or a packing behind the bolts that I can shift it a bit to even up the sides and to stop the wing rubbing agains the tyre under hard cornering. The difference between the top of the body and the top of the wing is about 10mm between the sides.
Simon