With that much contact area and a likelihood of the two parts being flexed
about, any good contact cement would probably do. But try Eastwood catalog #
31087 No Weld Panel Adhesive Replacement.
_http://www.eastwoodco.com/jump.jsp?itemID=1654&itemType=PRODUCT_
(http://www.eastwoodco.com/jump.jsp?itemID=1654&itemType=PRODUCT)

Cheers,

Phil