Went ahead and ordered the ones from CC. $339.83 with the discount.

Thanks for the input.

I have two NOS # 3904540. Are these the above OE Spears ???

My COPO recreation evidently has repops but I'll stay with them

Does each side use TWO or THREE of the mounting brackets ????

Each side uses one mounting bracket.

My mouinting brackets are still nice, not bent, not rusted. But the new ones come with the brackets.

Is 3904540 the part number being discussed here ???

Thanks for the education

Yes it is.

Here are the ones at Camaro Central:

https://www.camarocentral.com/1967_1..._p/3904540.htm

That's a pretty good price with that discount.