NOS piece for slide out spare tire carrier??? [E4TZ-1497-A]

[1986F150Six]

https://www.ebay.com/itm/NOS-FORD-TRUCK-BRONCO-1980-F150-250-SPARE-TIRE-SUPPORT-BRACKET-SLIDE-E4TZ/352330843805?hash=item52088e069d:g:Wj8AAOSwYutaypu2&vxp=mtr

[Gary Lewis]

I would say that's what it is.  The question is why it is an E4 when the catalog shows E8.  My guess is that they revised it in 1988, hence the E8.  And since my earliest catalog was published in 1982 and my next one was published in 1989 I can't prove it as nothing I have would show the E4.