
I wondered if OP was referring to this sway bar split bushing. If so, no worries.
I was camping once with my '97 Tacoma 2WD and one of the front sway bar bushings fell off from vibration after driving 15 miles on a bumpy gravel road. What a noise, scared me but it was an easy fix thanks to the split bushing design (along with a new bolt to replace the one that fell out).