318 vs 360 Rebuild...

Left side motor mount is different from 318 to 340 & 360. Some guys have made the left one work by adding shims to take up space. I went to Carlisle over the summer and picked up the correct mounts. Shumacher makes them but a little pricey but is worth the assurance of using the right mount.

Are the Shumacher MM's solid or is there some type of vibration absorbing material to them?