This is a set of 4 columns removed from a new planer.

This column set was removed from a modern planer. They are the same specs as the old Delta 22-540 with the exception of the concave top section. The last photo shows the modern column next to an original 22-540 column.

You can use a drill bit to replicate this dished out portion or just bolt it on as-is. The only thing that will be slightly off is the height indicator.

These are direct replacements for Porter cable Pc305tp planers