A/C brackets what works with what years/vehicles

Hi everyone, I need a little information on A/C brackets, for small block Mopars.
What years work with what vehicles etc. I am looking for Small block AC Brackets that would work on my 81 Ramcharger. (I know it a bodies forum but I'm thinking Chrysler used the same brackets for all small blocks I'm just not sure what the changeover years would be and if I buy older style brackets would they work so long as I buy an older style AC compressor. Also what about magnum motors? They are a lot more prevalent in my area. Just grab the pulley system off a magnum truck and get proper compressor?
My RC has all the original AC lines and controls. A previous owner swapped the motor and must have thrown away the brackets. Thanks I think this is more of a small block question than a vehicle specific question. I've asked on a RC forum but have had zero response. Guess they're not all that popular.
Thanks for any help.
Cheers to everyone.
Got anything like this attached to the front of the engine and alternator? My compressor is mounted using the two holes at the top with a few other brackets.

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