67 C10 Door Skin

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I need to re-skin the passenger door on my 67 C10. After I purchased a repop panel, I noticed there’s a difference behind the inner door handle area. The original door skin has an inner reinforcement panel and it’s missing on the repop panel. Should I remove it and re-use it on the new panel? I’m unsure if this was specific for 67’s or if it’s even needed. I’ve searched the forum and couldn’t find an answer. Does anyone has a link or any suggestions would be appreciated.