These grommets fit my '74 F100 with 1/4" flat washers and provide much needed thread coverage unlike standard bolts which only have small threads.
Pros
SAFETY INSTRUCTIONS: Wheel mounts are an important safety component. Please ensure these jam nuts are the correct thread size and length/width prior to installation. Also make sure your wheel eyelet fit these nuts. Installing the wrong fasteners is unsafe and could result in the wheel/tire loosening or falling off while the vehicle is in motion.