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I've had OEM replacement links on my Hotchkis bar, car is dropped 3" and they have performed admirably for over 40K miles. Can't remember the brand though, .
Get it in a lift, grab the input shaft with both hands and start aggressively pulling it up and down while someone visually inspect the bushing. Rinse/repeat for the sides where the axles are.
Also you can use binders on the front tires on a drive up lift and lightly drive fwd/rev while inspecting the bushings, make sure to bind the front of the vehicle really securely though and leave the drop-stops up