im not sure, but thought some buick came with left hand studs, but may be wrong. when i got it, one other owner that i got it from, was going to cut the top off to put on another truck, and the thing would hardly roll with one lug nut hardly even on, because it was a right hand nut, and the rest were broken off thanks to gorilla arms and not thinking there was a reason other then rust keeping them from coming loose. on a Bright note for me, the truck, a harley, VW bug, dirt bike and other little items were bought for one price, and the harley was resold for the total price paid, so everything but the harley was free.
The under seat heater has little radiators in front and back and heater hoses to it, and thats how i first noticed it, by wondering why heater hoses wnt under the truck.lol