I have similar "deh-deh-...." noise on my '71Z with a used differential I installed. It also is in tune with revolutions. Did you find a specific bearing bad by visual inspection or did you just go in and replace both bearings each side and noise disappeared. How much trobuble did you encounter pulling the axles and removing the bearings.
Just replaced these bushings on my '71Z. Picture looks about right. The bushing with the thicker flange must be on the rear side of the control arm. The thinner one goes on the front side. The package should then fit snugly to the frame mount. Hard part is getting the old sleeve out and then cleaning the old rubber from the control arm ID. Good luck!