main kit is the same its just the front little brace thats diffrent. i have a 79 frame with a 81-up kit in it. i just drilled 2 holes and bolted it up like stock. you could prob do the same for the one big hole in yours.
pm me as i might have a correct one for you. i think mine i got was for the older and i have the newer frame and might swap with ya. if you want. but its at home now and not with me. i will check later.