Hole in bracket should be 40mm and the whole idea of it is to be tight,it should in effect form a firewall seal as in the Sierra.
I fitted mine yesterday (fabricated in 3mm courtesy of Saturn)and it's a perfect fit.
Push the large rubber into the hole,dome face to engine bay side then fit round bush into it with the aid of a small screwdriver to gently lever the lip over,the other part fits on the column and the washer slides down to secure it all together.
Good luck.
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