With the compressor and alternator pulley down I then began attaching them both to the main bracket. The compressor is mounted to the bracket using two (provided) spacers—one between the main bracket and the compressors upper rear mounting ear and one between the bracket and the compressor lower rear mounting ear. With the spacers in place the compressor is bolted to the bracket using two 5⁄16-18x4 1/2-inch 12-point stainless bolts, washers, and 5⁄16-inch Nyloc nuts (Note: the compressor is fitted with press-fit bushings in the rear mounting ears. The compressor will fit a bit loosely until the bolts are tightened.). The alternator uses one spacer and one 8mm 12-point bolt and washer at the top mounting ear.