Don't do the template mistake
Hi
I'd stay away from the templates. I got one with my snorkel, checked it as best I could and drilled the holes, only to find out they were off

. I could make two of them wider with a file and had to redrill the two closest to the door.
I might have a different supplier but still. A tip for getting the bolts in the right place is to use a cut of bolt (without the head), screw it in to the snorkel, place it where you want it and gently whak it with your hand. The dent is where you should drill. (And don't worry about the dent, you'll drill a much bigger hole there anyway

)
Also, the outer aluminum is easy to drill through, don't rush it. The inner one is thicker and iron so get a good holesaw, I didn't and it took me forever and ended up with a lot of grinding to get it good.
Regards Johan