[ChevyMex]

I have bought inner and outer grills, both are repro parts. I also bought the grille hardware kit, but im strugling trying to insert the plastic nut into the outer grill, i am putting alot of pressure and it looks like these nuts will not go inside the outer grill square holes, is there a procedure to install this plastic nuts? or i just need to give up and work around and use standard metal nuts and screws?