At least post a pic of the back sides and some measurements. I agree they look like either 49-50, 51-52 or 53-54 Chevy but all 3 of those are different and your single picture is not enough to give a solid ID.
Show the back side latch mechanism while youre at. That can help id between the years. Im guessing 51/2 Chevy
Any thing they are big enough to cover the existing wheel opening on? Some they will probably fit better on then others, but hey, fender skirts are made to cover wheel well openings. Modify as required.
49-50 skirts are taller on one end than the other, these seem like they are based on the measurements (although the tape measure isn't real square in the one pic) if they are taller at one end than the other, they fit 1949-1950 Chevy passenger cars as well as all 1949-1952 Chevy station wagons. One thing that's throwing me off though, do they both have the latches on the same side? Because that's a 51-52 only thing. Are all of the back side pics of the same skirt? You need a picture showing the back sides of both skirts in the same picture, and try not to crop anything out of it.
Chevy factory fender skirts 1949-1950 Are much larger on the front end than your photos.. 1951 and 1952 are the same for both sides of the car (only years that these were the same) If they are different for both sides they are 1953-1954