and following on from the previous posts
i can now say it does fit
without any spacers

there is 4mm above the inlet pipe and about 1mm above the air box
there is a tendancy for the engine to rock to the left when revved, so the airbox gap increases to about 2mm and a space of 2mm to above the pipe

just enough to get a sheet of paper under

this was done by careful (very careful)
by bending the strut bar
i made a jig up on workbench which supported the bar
then carefully bent it by mm at a time
adjusting the jig to allow another mm of movement
the result is slightly deeper bends
no creases
no grinding
checked fitment on the car constantly
and hey presto