I also just finished installing them in my 53 1/2 ton. I did not use them "whole", but cut what I needed to patch. The corners for the original battery cover had Radii that were too large, thus the cover did not fit right. So I cut around the originals which were still intact.
I was satisfied with the result (It's a driver) and was able to finish with a solid floor. There are some small misc holes missing, but these are easily installed on assembly (most likely a better time for them anyways).
Cheers,
1953 Chevy 1/2 Ton Pickup
