The doors will bolt on but in the back /top the sedan has a curve for the roof line , the wagon is straight , the grill , marker lights and running lights will not fit , unless you use the fenders and hood , side door windows are straight on the wagon , I am putting a 75 front end with a 76 grill in my 79 Cruze wagon, the windshield from the 77 would fit the 80 but you have to buy the gasket that goes around it to do so , but I would keep the one you have in the 80 , its glued in like the newer car and less chance to leak , wheels and every thing is the same , to 77 has a 8 inch rear because of the V6 , use it , hope this helps , and also do not throw anything away , you or someone in the future may need it , 🍺