Mildenhall Fen Tigers have brought in Rye House's Danny Halsey and King's Lynn's Lewis Blackbird, with Ollie Rayson switching to the Stars.
Rayson, 18, had been named in the Fen Tigers' initial line-up for 2011 but makes way for the incoming pair.
Blackbird, 24, and 22-year-old Halsey join Mildenhall permanently, while Rayson becomes a King's Lynn asset.
Rayson is familiar with the Norfolk Arena track after riding for the Stars at the back end of last season.
He could ride against Mildenhall this season in the National League if he lines up for King's Lynn's youth team.
The Fen Tigers have one more slot to fill in their line-up for the 2011 season.