correct radiator support pad/shroud

[gramps77]

my 77 is a heavy half ton with factory air and 4 barrel 350.
The radiator was replaced with 32-2934 radiator (3 core) here http://www.lmctruck.com/icatalog/cc/full.aspx?Page=176
My problem now is the upper shroud that bolts to the radiator support and pads (part 15 or 16 and 9) here http://www.lmctruck.com/icatalog/cc/full.aspx?Page=177
do not fit correctly. The truck has what according to the shroud page is a shroud for a 454 (part 32-2850 item 5 on that page).
What upper metal shroud to radiator support and pads should I need?
part number 32-0970 was at least a half inch too narrow to fit the radiator correctly.