130b deluxe delivery rear bumper irons

[d.]

A friend of mine has a 130b sedan delivery, 1930. His question is what rear bumper mounts are correct for this vehicle; the irons that mount to the frame and go over the rear crossmember.
Would sedan irons fit or does he need to modify some irons to fit his delivery? There is a lot of body hanging out past the rear crossmember on this model.
Any tips or advice gladly accepted, and thank you,
Doug