I'm guessing 31 Ford deluxe roadster, BUT 32 is similar. Unfolded might help. I think mine had a number cast in to the front corner top socket.
They sort of look like Ford `30-`31 deluxe or `32 , but you can tell they have been chopped, since there isn't as much length as there should be below where the wood ends on the rear upright. `28 through `31 standard roadster top irons were formed tubular, not made from flat stock like your photo. As "hotrodA" said there should be a number cast into the front corner brackets. That is how you can tell if they are `32 or `30-`31 deluxe.
I could take a set of 30-31 Deluxe bows off the rack to check things. I think your set is missing one bow. Bob
thank you hotrodA, Dirty Dug ,stillrunners and The 37Kid......the knowledge you shared has been very helpful.....