Orin Bivens made some of these up awhile ago, I was wondering if they're still available, either thru him or SupraSport or Jeff Watson or whoever? If I recall, the price was pretty competitive with the stock mounts, and since one is broken on my engine, I figured I'd replace them with something that will last. The poly mounts reduce engine movement, but increase felt vibration from the motor, but not as much as solid mounts, right? Anyone have them installed? Thanks!