What are "Counterpart" parts?

[samkost]

I’m glad to see this thread revived.
I have purchased some Counterpart items for my restoration and most seem decent.

But,
I have recently had concerns about quality parts from online retailers/suppliers.
I have been dealing with a stiff/non power brake pedal with all new components with the exception of my OE cast iron brake proportioning valve.
It took a while but I finally located an original AC Delco double bail style master cylinder.
It was installed with a new shiny out of the box POL Cad/Zinc power brake booster.
Long story short I got a bad leaking booster with no vacuum capabilities.
Put my OE Bendix booster back on and now I have perfect pedal and functioning power brakes.
Money down the drain for pretty and shiney Taiwan/Chinese junk.
POL will never see my business again.

And also this from a few years ago.

Originally Posted by 73737373

Mar-K....trim maker, not overseas, made in Oklahoma City.

Not all trim parts sold by Mar-K are manufactured by Mar-K.
I ordered all the upper and lower tailgate trim and cab divider trim set.
Trim and hardware were excellent.
Most of Mar-K products are excellent, for instance their early and later year side molding (upper and lower) are made in house.
Quality stuff.

Tail light bezels on the other hand were Counterpart or some other off brand.
When I received them I called with my concern mainly about the inflated price/shipping and indeed they agreed that they were not made in house.
I received some compensation for the price and they changed their description of certain trim on their web site.