Big Block,
If you've got an amazing car, you may want to get the real deal from George at Authentic Classics (BTW one of our PagodaFest Sponsors!!!). They are rare and expensive, but there is a certain Panache to seeing that Tri star on the gleaming cap. A decade ago I ordered mine from Mercedes, and they matched the keys on my 1970 using the VIN. Nice to have one key to the whole car.
If you drop a 440 six pack under the hood of the 113, I will be impressed...
Mike Mizesko