Gee willikers….if Ford has that right, that tension pulley may not be secured?!?!
Looks like he’s got the right one….
There’s grease around the hole in the cover….grease and grass underneath…...that’s been in service recently. It’s not a extra/spare part bouncing around.
It’s only secured by the grease zerk - probably not much risk of popping off, but best to verify sooner than later.