Inner fenders-big truck

[ford35lh]

Sorting out my sheet metal I found 4 pair of inner fenders.
first photo shows them lined up with two high-lighted areas.

The 1st and 3rd set have a spherical bump on the pointed
edge versus the 2nd and 4th which are smooth.

The second photo shows the upper front corner,they are lined
up in order,1st,3rd,2nd from the first photo. The lengths are the
same but the 1st has a longer upper corner. The other two are
different as the 3rd has a separate piece attached to finish off
the corner.

These are all supposed to be 35-37 truck. Any information or
explanation would be welcome.

BTW,the 5th pair are pickup.