It was for me. I got the Jeep driving with cold A/C. They sent me the wrong header panel, or I would've been further along. The metal is so thin, what I thought was going to be hard, popped out pretty easily. I'm not sure if that's a good thing or not.
'75 F-250 460, C6 Monster Truck (Earthquake III)
'78 F-250 Ranger 514, C6 2WD (Future Earthquake IV)
'79 F-200 300-6, 4 spd. (Alice)
'77 International Toterhome (Mongo)