lower control arm bushings

Just ordered the wilwood brake kit and most of the hardware for the front end rebuild on the 68 Valiant from Mancini,and found out that the poly lower control arm bushings are no longer being offered. the salesman noted that guys were having issues with them coming apart. Has anyone seen this with there front ends? I do have the poly lowers in my 69 swinger but havent seen any problems yet.