From CCR's site
FRONT AXLE CCR's own 2" x .250" wall, 5" drop axle is the tightest 4-bend axle available. Includes king pin bosses 100% Heli-arc welded in our jig. Measures 50" center to center at top of king-pins. Shown w/hangers.
It shows the basic, bare axle as Not Available.
It does show the axle with hangers available bare and chrome. I do not know which you are looking for.
The hangers are described as longer than typical, but that should not affect bolting them up, provided that the
width at the hangers is close, and the spread between the top and bottom hole is the same as the arms you are using. The longer hangers might require shortening the arms or moving the mount back.
The one inch difference in overall axle width per side might need a slight angle adjustment, but if you were building your own frame, this is just another fitment step.
The 5 inch drop VS a typical 4 inch drop should not make a difference for someone who is building, but you do need to check caster and clearances when mixing and matching parts.
Ron Pope another site sponsor shows an axle here.
Dropped Tube Front Axle with Bat Wings Made from 2" DOM Tubing with a 1/4" wall. All axles are approx. 48" center to center. Available for '37-'48 Ford Spindles and '49-'54 Chevy Spindles. Bat wings are spaced 30" apart. Bat wings have 5" center to center hole. Item #: 5025
eztbucket.com
Dropped Tube Front Axle with Bat Wings Made from 2" DOM Tubing with a 1/4" wall. All axles are approx. 48" center to center. Available for '37-'48 Ford Spindles and '49-'54 Chevy Spindles.
Bat wings are spaced 30" apart. Bat wings have 5" center to center hole.
I have bolded the important measurements you can check against the plans you have to see how close they are.
Of course, you can also use other axles such as the old Ford I Beam axle, but this will require more fabrication.
One example, I do not have experience with this seller.
4' Drop axle for hot rods, Model A, 32, and 34. Designed for use with 1937 - 1948 Ford spindles and stock 2' perch boss. Plain finish I-Beam. Manufactured as one piece forged steel with a 1045 heat treat. King pin center to center: 48'. Spring perch center to center: 36 1/2' (Use 31 1/2' spring).
www.roadstersupply.com