Review on Alloy USA 11800 Suspension Ball Joint Kit for 07-18 Wrangler and Grand Cherokee - 4 Piece by Joe Patterson

Inserted Lead. They were difficult to press in, but did it with a percussion gun and a ball joint press. After installing the bottom grease fitting, remove the grease fitting and then use the tip of the needle on the grease gun to inject grease into the joint. After grease begins to flow from the boot, screw the low profile mirror back on. The easiest way to deal with it. I think I used a 4 inch needle lube tip and bought it here as well.