Ok i get what you mean, ill need to double check it with a fresh head tomorrow.
But if i can find nothing astray.
if im at the front of the chassis the right hand side is fine, am i ok just bringing the studing sligtly out on the left hand side at the top, along with U2 as you said? to ge the bracket in. Also should i bring the top brackets out a bit do the lower brackets need to come out too?