John,
the nipple closest to the top of its respective tank is the inlet, and the nipple closest to the bottom of its respective tank is the outlet. The Panteras oem radiator has both nipples near the middle, which places the upper nipple in the bottom of its tank, making it the outlet. Make sense?
to answer your question, the Fluidyne radiator duplicates the layout of the oem radiator, so yes yours is plumbed properly.
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