I have a problem with the ones sold as correct for a '54 on my '50, which has the 47-53 updated arms which accept the 54 blades. The problem is that the blades are extremely wobbly and don't do their job well at all.
I am going to tinker with them to see if I can tighten up the slop somehow.

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