Help needed on 70 Cougar Eliminator under dash wiring

[Mike_B_SVT]

An even greater question in my mind involves the fuse box under the dash:

The fuse panel for the Mustang and Cougar is shown in the WCCC free download for the 1970 Cougar wiring and vacuum diagram and on Page 36-03-03 of the 1970 Car Shop Manual volume 3 electrical. That fuse panel diagram shows the number 7 circuit (20 amp.) EMERGENCY WARNING, HORN (MUSTANG ONLY) with a fuse in place and both ends to hold the fuse. On my '70 Cougar Eliminator, there is no fuse and only one end to hold the fuse. There is NO WIRE leading to the one end where the other fuse holder end should be for this EMERGENCY WARNING circuit. It looks like it was made that way from the factory; is this common on '70 Cougar Eliminators???

Please address both of these questions. Thank you again for all of the help!!

Here is a picture of my fuse panel (1970 Eliminator, build date Oct 6th, 1969).