Energy Suspension’s urethane insulators offer a more secure hold than traditional rubber mounts, reducing startup shake and minimizing engine vibrations through the frame while driving. After a successful installation at 40,000 miles on my '32, I wouldn’t go back to rubber mounts for future projects. The kit includes a pair of urethane insulators, and Energy Suspension recommends using the preload plate for optimal performance. Please note, the frame plate shown in the picture is not included.