You can also buy an SR Royal ESL (Extra Super Light) Stem. It's the same thing, although it will say "SR" rather than "Suntour" (That's ok the company today is called, "SR/Suntour"), you can find the pictures on equusbicycle website (I cannot post the URL here, sorry) in the catalog section for Sakae.
I think that there is an ebay seller in Lompas CA, Cafe De Velo, with a shipping container of these ultralight stems. They are not for violent track sprinting, they are hollow and drilled and for people who really yank on the bars, they can break.
The SR ESL model came with titanium hardware but the suntour model might have had steel hardware (I don't know for certain about the suntour model.)