Any speculation that Ben or Eric Bostrom will be switching manufacturers in 2004 seems far-fetched.
Ben will ride for Honda next year in the US. Eric for Kawasaki.
Eric just signed a two year deal with Kawasaki (which could easily put him in GP at any time, seemingly).
While Ben, according to insiders; has a one year deal with an option on Ben's part for 2004. If he does decide to ride for American Honda in 2004, the current contract states he is guaranteed a Honda GP ride in 2005.