b pillar question

[Chulisohombre]

3529883 1969-72 Blazer / Jimmy rocker box reinforcement assembly plate. This high quality replacement part is manufactured for GMCPauls Truck Parts. This part reinforces the following 3 major points on the underbody by bolting to and joining the rocker box & end cap to the inside of bedside at the rear door pillar and attaches to the step up in floor just behind front seat. They are a direct bolt in replacement for the originals that commonly rust out in these vehicles. Original 16ga steel construction made in the USA. Specify left or right in cart.
Picture of Blazer / Jimmy rocker box reinforcement assembly plate installed

$129.00
Not cheap but looks like what you are after. This is the lower b pillar just behind the rocker that ties all the pieces together and blocks off the rocker box looks like.