So I DIY this on a wet wend in sydney and so as a heads up for others. The holes drilled from the centre out about 7 are about 1-2cm off and could be back that much due to where they are placed there is the metal support so to get the nuts on I needed a magnetic pen wand to place over the washer and the nut with blutac to hold it in centre of the hole to get it over the bolt.
One thing to drill through the plastic bumper another to drill through the metal support which no I won't go there.
2 bolts longer so be sure to use these where required at the ends.

PIA like no tomorrow so a hour job takes 3. And patience required. Will place pics of it later.