I'm helping a buddy install an echobit bolt-on shackle flip this weekend. His rear shackle will need new bushings (WHAT SIZE ARE THEY?)...We also plan on installing the ORD h/d shackle for his front suspension. What size bushings are needed for the frame side if the shackle? OH, and does anyone know what size ubolts are needed on the rear to replace his "made for a 4 inch block" ubolts?