Why F-150 year and trim matter
Different F-150 generations use different key and fob systems. A basic spare for an older truck is not the same job as a push-button-start fob for a newer model.
Work-truck realities
F-150 keys get worn in pockets, tool bags, trailers, job sites, and desert dust. If the blade is bent, the remote shell is cracked, or the key only works when wiggled, mention that before service.