I have been wanting to change the glow plugs but all the horror stories about seized or broken tips scared the crap out of me. Mine were all Motorcraft Beru and came out fine. Easier than changing spark plugs on an old E 350 van. I bought DieselRX. Made in U.S.A. Motorcraft are not. If DieselRX are good enough for the Military they are good enough for me. All the boots were gone so I bought the 7.3 crimp on heat shrink kit. The GP arrrive Thursday. At my age and the cold weather I broke down this project into 2 days.