[mln385]

What I did was use aluminum angle, drilled the fiberglass oem shroud and cut to fit. I sealed with black rtv to keep it air tight for better air flow. Allowed for overlap to bolt to the new radiator, you will need to fabricate a lower mounting bracket as the New BDR radiator is taller then the stock one.

I would also recomend weatherstrip in front around the opening.
I added another pictures to my link that may help.