Don't know.
That will have to be your call.
Personally I wouldn't worry all that much about the hardware (brackets and rubber mounts) - those are likely fine. Nice to have new ones, but likely not essential. However, if I got in there and found that the mounts were deformed/damaged or whatnot I might wish I had new parts.
I would worry more about the quality of the condenser itself AND the desiccant/filter. And for some of those online prices you might search up you need to be careful to note whether or not the filter is included or is a separate item. The drier "housing" is permanently attached to the condenser, but the filter/desiccant can be a separate issue/cost. You do want to use a new (high quality) filter. Also note that, at least sometimes, "perfect fit" after-market parts are anything but...
Personally I would go with the Honda OE part which comes with the desiccant/filter - when I looked online to respond to your other post/question it seemed to be about $270 (for a 2001). That's not horrible. And, if I interpreted the schematic correctly, it came with all that nifty new hardware.
But, it does depend upon the price differential (and how long you hope to own the van) as concerns using after-market parts. And, of course, it depends upon the reputation of those parts.
Sorry I can't really give you an answer. And sorry for the rambling attempt...
Best of luck.