Eric
If they're just the square pads that car and truck shop shows in their catalog, with a hole in the middle and maybe a sleeve around the bolt, it wouldn't be hard to build a mold and cast your own from polyurethane. It's available from a number of sources in 2-part form that you pour into the mold. I've rehabbed my axle and transmission mounts using that process. Silicone grease works as a mold release.
