10 Dec, 12:23
Ireland's John Lacey will referee his first ever RBS 6 Nations while Alain Rolland is also included in the Elite Panel in what is his last season.
Longwell missed the Glasgow game after injuring a shoulder in the international against Argentina while Ward and Stewart played their way back into the side having come on as replacements in the victory over Glasgow.
Ward scored a try in that game, a score that had it's origins in a superb Constable break, while Stewart will be remembered for squandering a try oppportunity when on one occasion, he ignored James Topping outside him.
Ulster: Bryn Cunningham; James Topping, Ryan Constable, Johnny Bell, Scott Young; David Humphreys, Neil Doak; Justin Fitzpatrick, Matt Sexton, Robbie Kempson; Gary Longwell, Jeremy Davidson; Warren Brosnihan, Neil McMillan, Andy Ward (capt).
Replacements: Simon Best; Paul Shields; Mark Blair; Tony McWhirter; Kieran Campbell; Adam Larkin; Sheldon Coulter.