Very cool flat car project Mark. Model a later era myself but am always drawn to earlier rolling stock technology.
But I digress, mistakenly identified my CONX tank car as #8, should be #5. Anyway, got to the couplers using the Wiseman box assuming Kadee 26s would work, no dice, need advice.

It's a Wiseman kit and I don't have instructions. I don't need instructions but I imagine they
would indicate what couplers to use. Anybody have an idea what Kadees might work?
Oh, and Happy Thanksgiving!
Thanks,
Mike