Welcome to the forum.
You need to keep in mind that the number
ON the part is an engineering number and not the part number that you could order.
But often on eBay you're going to have sellers listing the number they find and not the
actual part number.
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.