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You are on about the hole in the side where the lower belt rail is aren't you, not the floor pan?
We ran the normal 25mm ones on my mates Clio. Don't know why the standard bolts are so long because the threaded bit in the body isn't that long...
Yeah mate, just put it under the bolt that holds the subframe down, with a decent washer on though.
I'd just use the outer bolt hole where that belt rail was and screw this in