I am not sure if they are reproduced but they are just sheet metal (18 or 20 gauge) and can me repaired/fixed. If a section is really bad, you can patch in some new sheet metal to repair it. Better than replacing it.
I removed this on my Cuda and built a gusseted 3/16 steel replacement that not only protects the radiator but can be used as a jack point, tow point, etc because it is fully welded to the frame on each side and I still run the strap from the radiator guard I built to the K frame.
70 Challenger RT 440-6, 73 Cuda (under const)
05 Durango, 99 Dakota, 01 Ram 4x4, 14 2500 4X4, 10 PCP Challenger RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR, 61 Jeep FC170
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)