Lower control arms.
They seem to be hard to find. Where should I look? Thanks in advance.

 

rockauto.com

 

They don't have them.

 

https://chevroletforum.com/forum/exp...19/#post460878

 

here's what a quick google search brought up
https://www.oemgmpartscenter.com/p/C.../12548330.html

There's always the junkyard

 

If you are unable to find the control arm, you rebuild the one you have. Ball joints and bushings are available.

 

Used ones shouldn't be hard to find, huge interchange on them.

 

What vehicles?

 

Shock mount is almost rusted off.

 

You're kidding, right? They made these vans the same way for 25 years and then shared parts with squarebody trucks. You should be able to go outside of your house, throw a rock in any direction and find a truck with the same parts.