Other than that, try the parts department at the local Chevy dealer. They don't have pictures, but they might be able to show you a break-down from the parts catalog, or if they are computerized, perhaps print out the page with the brackets and alignments on it.
From L to R: PS pump (top); alternator pivot (bottom); AC compressor (mounts on top of the compressor to the intake manifold); Alternator tension arm
And the AC compressor bracket (sans idler and tensioner pulleys):
The alternator pivot bracket mounts to the water pump using water pump mount bolts, while the tension arm uses a dedicated hole on the WP. The PS pump bracket mounts to the water pump, sandwiched between the WP and the AC compressor bracket. The compressor bracket mounts using two WP mount bolts, and two holes in the driver-side cylinder head.