When my ignition tumbler got loose enough that I could remove the key while running I purchased a set of 3 cylinders from Amazon for a later model pickup.
Name brand and inexpensive.
I really like having just one key.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.