I recently purchased a 1949 Dodge wayfarer, it was a factory base model - no trim and I'm wanting to correctly place the rear fender moulding.
If I was to measure its placement this is what I would do:
Passenger side:
1. with piece of paper; place it level under the trim and have it touch the welt of the fender, mark the length for the left and right positions of the trim to the welt of the fender.
2. with a yard stick or a small wood trim strap, edge on the floor/ground and parallel with the fender at the trim edge and with a small adjustable set square, mark the bottom of the fender and bottom of the trim ends and note the distance between those marks.
Thank you so much