I've been looking all over the web using the Jag and Lucas part numbers and haven't can't find even a photo of this component, only a diagram! I've hit a brick wall with this one.
I have found some casting products that are liquid and set to make a rubber. I could make a mold and cast something that I can put over it to make something that is approximately like what I had before. However, I doubt I'll ever have the time for that.