Hi Lance ,
I kitted my 240 out with AC a couple of summers ago. which compressor do you have, Diesel Kiki, Hitachi or something else?
i think realistically you would have to throw away the whole bracket and pulley setup and get a new one from the USA or a later model L series powered car.
The US companies mention fitting a Sanden Style compressor which is just a chinese version of a quality Japanese compressor. The chinese one would probably be ok but by the time you ship a cheap compressor from the US you may as well buy the best. I think i paid $450 for a Sanden compressor from Ashdown Ingram.
The bracket i acquired randomly bolted to the L series engine but didn't have any pulley system so I welded up some bits and pieces to get it to work.
If i was to do it again and didn't stumble across the random bracket i found . I think i would buy the pulley only from the US, get it here and source the rest locally . the US pulley has adjustment in it already.
the Sanden Compressor is a SD7H15 these can run a cool room on a catering truck , are compact and look the part.
I have attached a pic of mine