I don't think the zerk is smaller just the space to fit the grease gun. I filed the end of my grease gun to fit better.
hope that helps, Dennis


95 Sportage, gone but not forgotten.
98 Jeep TJ, 4" Zone springs with RC Long arms, Ford 8.8", 4.56 gears & Detroit locker rear, D30, 4.56 & Detroit Trutrack front.