Dave 36 through 39 all look similar ,I cant tell from a picture,
where they bolt to the body differs slightly as well as shape of the fender. Just have to try it...

as far as widening the fenders you can add a piece where the fender meets the shell and where the fender meets the cowl area.

you could draw a line about 1/2"-1" from the front of the fender to the rear at the cowl and put in a filler piece of metal 1,2 or 3" or what ever you need to cover the tires.

OR you could cut the fender down the middle(crown of the fender) from front to back and add the metal there, but remember you will need to do the same to the running boards.

it sounds hard but it really isn't that bad. Ron...

here is a comparison of fenders the gray one is a 39 it looks longer from the tire to the rear to me, yours looks more like a 36-37 to me...