Screw fixings for Mesh/Gaurds (Headlight and Talilight)?

Hi All,
Perhaps yet another newbie question. I do search, I promise.
What fixings do I need for the headlight and tail light Meshes/Guards?

I see that there are square holes for the fixings but am a little perplexed where to get hold of these!
Cheers guys!
J.

google Beal automotive for all body and trim clips and fasteners. They do a good line in most automotive stuff electrical terminals etc, all at good prices. Has your Landie got the holes in for the mesh guards?

It's got the holes at the front, they are square. There's none at the rear though. It an old MOD Series FFR

Pretty sure Beals stock plastic inserts for the square holes, they take a self tapping screw.

Are they the same size as the floor bolts?

I have a bunch of chrome spire bolts on order that are for the floor but not really sure they'll do the job.
These guards require drilling new holes. I'm wondering if some kind of square grommet and a metal screw will do the job? Someone must have fitted these themselves?
They are like these:
345985 HEADLIGHT MESH LIGHT GUARD | shop | www.lrseries.com