A/C compressor?

[rmneder]

I want to get the factory air working on my truck. I have all the original parts either still on the truck or in a box, but I have them. The only real problem I can foresee is I have headers and the compressor has a bracket that mounts from the stock manifolds. I've searched old threads and someone suggested there is a header bracket that replaces the one on the manifold. I've tried a couple from different manufactures and they don't seem to line up. My question is if I got one of those direct replacement aluminum compressors that use factory brackets but are about half the weight could I get away with not using the lower bracket that mounts on the manifold? Thanks for any help.