The older bracket works only for the York type compressor.
The 4.0 will not work(easily).
One way out is probably the front end from a 3.9 (timing cover out) which will give you all the bits you need for your AC plus a water pump and other ancillary parts that can easily be sourced . Can be had cheaply from a junk yard late model Range Rover. 87 to 91 would be the easiest years to scavenge. I've done this quite a few times.
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new expansion complete. Not only are we the only Rover shop in Eliot Maine...now we're also the biggest.
"Dedicated to the resurrection of junk through engineering?"