Tom--- In a word; "both". It's kinda' a play on wording. They are manufactured according to OEM fitment specifications so that they fit properly, and are new aftermarket essentially because OEM Isuzu no longer makes the item anymore. In more simpler terms, they are new aftermarket cladding manufactured to OEM fitment specifications. What they DON'T tell you is that the color/hue and surface texture is completely different from OEM cladding.
Still; since the aftermarket version and OEM version do not match identical with the same surface texture (Aftermarket Lizard Skin vs OEM Smooth), the two versions should not be inter-mixed on the same VX. Either go 100% OEM cladding or go 100% Aftermarket cladding all around the entire VX; but never combine both versions, as it is very distracting and a dead giveaway of individual panel replacement.
However, I would say that if a VX owner had later plans to re-paint or re-surface the entire cladding with say LINE-X or another form of grainy texture filling paint; then yes, buying the cheaper aftermarket cladding may help somewhat in that scenario and they could be mix-matched as a sub-base structure/platform. Athough, if the cladding is to remain in its most natural form (unpainted/un-LINE-X'd), then all of the cladding panels should be of the same type/texture.
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