I am coming in late on this thread, and started at the bottom and progressed to the beginning of it.
As I got started, my knee-jerk reaction was, "Why all the fuss for a plug to fill a hole which really doesn't need plugging."
Then I saw the post with the picture of the Bow Tie freeze plug fillers.
Now I get it! Can't argue with cool.
Carl

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission