can i ask what length your M4 allen flat-head bolt
i was thinking 20/25mm would be long enough?
I used 16mm length bolts which was perfect.
Bolts are M4, washers are M5 (for total approx diameter of original rivet heads as the holes in the skirts are quite big), and stainless splined rivnuts have M4 thread with 6mm outside diameter (1mm wall thickness), which required slight enlarging of the rivet holes.
Rivnut link is here: http://www.ebay.co.uk/itm/170778239746?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
Thanks
i have a funny feeling the holes in my arches have already been Enlarged by last owner
did you take your doors off when doing it???
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