I been seeing those too, must be made in China is all I can figure. But as stated, I would be suspect, I mean Stainless? really? for THAT?!?!
On the other hand, I may take the chance on some for the Saguaro if for nothing else, just to see. Would be nothing for the Chinese to buy a set of Bassett's or Rewarders, copy them, build them with decent materials in their child slave camps, and SINCE we have free trade with them for some reason........you know where this is going.
Although sealing and fit is PROBABLY going to be an issue because I'll bet there's not more than 2 or 3 BBC/BBF powered jet boats in all of Asia to test fit some on for QC (if there is such a thing in China). I was officially told I did NOT see perfect replicas of current BMW's, Audi's and a Porche Cayenne (Called a BWM, an AVDI, I forget the Porsche one) at a Shanghai car show a few years ago either, so the Chinese officially don't copy anything, forget that!

Ray