NEED HELP- Front rad support-grill-filler pan??

Hi there, i am almost at the painting stage of my duster, and am lining up the doors and fenders etc. i wanted to put the grill in to make sure everythings lined up and it seems like im missing something, or something, there is something wrong haha, i am building the twister with the shark tooth grill, i have the rad support and grill but no filler pan, a buddy of mine said there is one, does anyone have any pictures or can anyone tell me what i need/what i am missing, any help will be greatly apprectiated.