I would like to meet the subhuman that designed the heating system for 1st gens. I am replacing the heater core in my 70 K5. I can understand removing some components in order to remove the heater core, but the inner fender and hood hinge????? All those moron engineers had to do was move the whole box over siix inches and it would fall out. Anyhow, the core was only 35 bucks through NAPA, and it actually fits.