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Correct “asymmetric” hull ventilator for all M4A2, M4A3, M4A4, M4A6, and Chrysler, Pullman, Baldwin, and AlCo built M4 hulls. The PSC M4 used the same symmetric vent as the M4A1. There is an image loaded below showing the proper orientation of the part. Most kits on the market have this part wrong. Either the asymmetry is wrong, or omitted all together.