R4 Compressor brackets for Gen1 sb?

[Boyd]

I'd like to add the newer style R4 compressor to my A/C system and I've done a search on the second gen board (nastyZ28.com). I found a large group of people that want to do the same thing, and a large group of people recommending brackets that will allow you to bolt an R4 lower down on the engine - but no one mentions who makes these brackets or lists part #'s. Any one out there have a clue about these mystery brackets? Thanks in advance.