They are made on "unobtanium". Your best bet is to look for somebody parting out a Javelin or buy a whole motor for parts. There are front "seahorse" emblems reproduced, but I’ve never seen the numbers…..but I don’t know everything. so maybe…..
The was a guy in the Canadian club that was reproducing them at one point. I think his name is Sandy Lup??
I won’t post the link here, but search the web and you will likely find him.
I’ve read that javelin1957 website, and while I haven’t e-mailed to any of the links contained in it, my experience is that websites that haven’t been updated in a decade are usually loaded with bad links…