I think you are talking about the lower support for the radiator and intercooler. If I remember correctly, it is green primer steel or galvy.
I'd clean it up and paint with POR 15 or similar.
The sound panel is also important, w/o it, that support takes the brunt of impact when parking nose in at tall curbs. Can be bent back such that the rad hits fan blades and the intercooler is also exposed to damage.
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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