trunk pan replacement info needed

My car is 1976 dart sport, slant 6 nothing fancy, I recently picked up for 2k. Previous owner cut out center section of trunk, almost over to the seam of the trunk/quarterpanel dropdowns. I will not be doing any quarterpanel work and the tailpanel is fine. Will the 1 piece large AMD trunk pan replacement panel fit thru the trunk lid opening? Or will I need to get the 2 piece trunk pan sheetmetal from year one or another supplier? Last check AMD does not offer a 2 piece trunk pan replacement kit. I talked with a year one rep. at a show and he was concerned that year ones 2 piece sheetmetal was only listed for 1974 and eariler dart sports. Is there any difference with 1975 and 1976 dart sport trunk sheetmetal parts and what year one has available and listed for 1974 and earlier dart sports? thanks