Air Brake Parts, Stud & Piston, Spring, 1/2 of Air Can, New Old Stock (NOS)

Description

I don't know part numbers. From surplus school bus parts I purchased.
What you see in the pics are what you will get.
My measurements:
Long threaded stud on piston assembly: 13-1/2" long with 9/16-18 thread.
Piston: 4-3/4" Dia x 0.229" Thick
Spring: about 5-3/8" long x 3-3/4" O.D. at large end x 1-5/8" O.D. at small end.
Can: 6-1/4" O.D. body x 2" high. 1" Dia. Center Hole, 6-15/16" O.D. flange
2 Studs on can: 9/16-11 threads x 1-1/2" long, 4-3/4" Center to Center.
Purchase all, or nothing please.