Good brand of heater core for 1968 C10 and where to buy?

[HeavyHauler]

I am getting ready to replace the heater core and blower motor on my 1968 Chevy C10 shortbed with no AC. I was planning on just buying the Duralast brand both from Autozone but I also remember reading somewhere that some were having trouble with particular heater cores fitting in the brackets of the heater box or something like that?

[Jason Banks]

I don't know anything about this particular model but saw this the other day.

https://www.radiatorexpress.com/prod...220713/1321085

I was lucky to have a NOS Ac Delco that I replaced mine with. But when I was looking I could not find a Copper/Brass replacement. Was shopping radiators the other day and noticed these guys had the copper/brass heater core.

It does appear the way the end caps on this copper/brass model look they should work with the brackets in the box. It seems the aluminum cores have end caps made of thicker metal/aluminum which causes problems with the brackets.

[yuccales]

I did mine a year and a half ago, still working fine. Fit perfect. The bales fit the core fine. Mines a non a/c '70.