I've acquired a Behr underdash kit for my TD diesel westy.

I'm confused about the instructions, which describe the installation of
the condenser without saying whether the connectors (both face to the
outside on my condenser) go at the top or bottom of the
installation--in other words, which way is up? The photos are so poor
in the manual I have that I can't make heads or tails of the direction,
and I have no idea what kinds of brackets the instructions are talking
about.

All that said, is the Behr unit the most desirable? Would I be better
off getting a late-model factory condenser and installing it?

Are condensors "matched" to certain systems or compressors or will
about any of them do? The reason I ask is that when looking over
several in a junkyard, the amount of tubes and fins and the thickness
of the units seem to vary greatly. The thickest and most robust I've
seen is on my own 90 vanagon, the weakest and skimpiest seems to be on
a dealer-installed model with the overhead H pattern in the front
ceiling, with my Behr unit about in the middle.

Thanks for any info,

Jim