I've not drank in years. No real reason. not religious. Just noticed that on Saturdays, junkyards close at 1 pm. By the time I stop feeling shitty, its 7 pm Sunday night. So the weekend would get lost on a few beers from friday night. So I'm this annoying SOBER. Or as my wife says, " Powdered asshole, just add alcohol and instant asshole". And she married this asshole. Lets just say, I get to play with mopars and the wife doesn't pour gasoline on them.... it's a very good marrage. Keeping the alcohol out of the scene, keeps everyone happy and safe.
Back to that question: the 76 and 77 have symetric speaker holes on the back deck. The 78, 79 and 80 have the left and middle angled slightly- Can't figure out why.