[rotorwrench]

The headliner for the Ford Victoria should be pretty similar but Ford of Canada did things differently. There are likely a few owners of them on here that may be able to give more answers than I can about colors, styles, and materials.

I haven't had a chance to look one of these over very well but photos I've seen show ribbed bow supports or piping if that's what it is. The bows appear to be on the underside of the material. This is a lot different than the normal upper support type bows with listings to hold the headliner shape. I have more questions than answers for sure.

I don't have the body parts catalog for the 1951 Fords but it likely has some information on trim in there. The 1952 & later Victoria types seem to have more availability than that of the 1951 models.

If no one makes them then it would have to be fabricated by a trim shop if the OP is not a sewing machine type of person.