pivot boxes

Can someone tell me?
I am about to cut into my forks in order to weld in my pivot boxes but can't remember which way they go. Does the horizontal piece between the uprights go on the top or the bottom or doesn't it matter.
Thanks

This should help, if the attachment works.

http://www.pacificcustoms.com/mm5/graphics/instructions/irs-pivot-jig-instructions.pdf

Kev

Thanks Camo helps heaps.