Build sheets found where???????????????

My 69 A56 'cuda 340. I usually found build sheets between the rear seat springs and the cushion. I was so disappointed when it wasn't there on this car.

But then when I took it all apart, the BS was in the front BENCH seat cushion. It has the standard fold-down arm rest front bench seat. (w/ a 4 speed)

The turquoise car in the avatar is a 68.