Hey there, welcome to the site and all that..
Ask ford about these part numbers and tell them they are f-150 spacers.
I can`t remember if you only needed one of the numbers or both, but there is a right side and a left side.
#F2TZ-5A307-A
#3F2TZ-5A307-B
Explorer Pro-comp also makes a poly spacer you could probably order from an off-road shop.
-cheers