To confirm fitment, you'd need to:
* Find the bolt pattern (lug pattern): This is the number of lug nuts and the distance between them, often expressed as something like 5x5.5" or 6x5.5". You'll need this information for both the Excursion wheels and your 1986 F-250.
* Check the wheel offset: This is the distance between the mounting surface of the wheel and the centerline of the wheel. Different offsets can cause rubbing issues.
* Verify the hub bore diameter: This is the diameter of the center hole in the wheel that fits over the hub.
If these three measurements don't match exactly, the Excursion wheels won't fit. Even if the bolt pattern is the same, the offset or hub bore could cause problems. Using wheels with incorrect specifications is dangerous and can lead to wheel failure.