I have for sale a vintage National K 400 drive shaft repair kit. I recently got this in a box of stuff at an auction. I believe there were 2 different variations of the K400 made for 1929 thru 1942 Chevrolet vehicles. Although I am not certain which one fits which years/models. This one has a "B" stamped after the "K 400". Hopefully that can help determine the specific fitment of this piece.
$35