Wrapping up this 52 Ratmod build and Im trying to source some of the missing trim.Do any of you know if the lower rocker trim is the same on a 52ish Chevy?Im looking for the passenger side and it doesnt have to be perfect if anyone has a line on one I would appreciate any info.TIA

Freakin awesome ride.   Can't seem to find anything to help ya.  

I've been led to believe that some trim is interchangeable with Chevy.

I recommend you go out to the POCI website (poci.org) and download a copy of their Smoke Signals magazine for their want ads section. You MAY find someone selling the trim you need.

You can also try contacting Frank's Pontiac Parts in 29 Palms CA (https://www.frankspontiacparts.com/). He MAY have something that old, even though he doesn't specialize in Pontiacs that old.

You can also try Dessert Valley Auto Parts (https://www.dvap.com/). They could have something as well.