I installed new W-body.com a-arms a few years ago. They lasted a little over 3 yrs and 45,000 miles before I heard a popping and saw both ball joint boots were trashed. I sprayed with lube and milked them for a few weeks until it warmed up. I would not recommend them to anyone. My raybestos ones came with grease fittings as a plus.
_________________________
03 GT, STB, GM HD sway bars, 35% tint, GE893(37watt)fogs, Flowtech Terminators, 180 T-stat, ZZP DP & PCM, Ceramic PLOG & Crossover, 18" glasspack, 2007 17" Mustang Bullits 235/55/17 Pirelli PZero Nero, 12" R1 D\S rotors, gutted air box, GTP radiator