Tim, it is not on the streetrodshq.com site anymore. I found them today by doing a Google search for 1953 Chevy P/U door panels. Several returns, but the one that looks like mine is the RD4231 on Chevys of the 40's website. It is a full door custom ABS panel. It does not resemble the stock panel in any way.
I just checked again and it's not showing up. Frustrating!
Google 1953 Chevy P/U ABS Door Panel, mine is the third photo that shows up.