No archive page that I know of, but it would be nice to have. I used to ride a Silvio 1.5 and would have liked to have the original specs available. TerraTrike, for instance, has a history of the company's founding, and a page with a color-coded table for some of their
legacy models.
You might try the
Wayback Machine Internet Archive, if you have the patience. Searching for reviews on BentRider Online, and in the forums here, should turn up some information also.