Vintage Mopar part still in cool tin box

This is a really neat piece if history that I ran across. I am not even sure what the part is because the box has never been opened. The colors on the box show very nicely and it just looked cool sitting on a shelf in my rec room. If anybody knows what the heck it is I would be interested in knowing.

It is identified as WC repair kit part# 947 580.

$20 plus the ride to your house