‘Shaun O’Hara, who could be the Browns’ center in 2003, spent Tuesday in Buffalo visiting the Bills. It’s not known how much interest the Bills have in O’Hara, but their right guard, Marques Sullivan, is not entrenched. O’Hara started 13 games at right guard for the Browns in 2002 and three games at center when Dave Wohlabaugh was injured. The Bills would have to complete a deal by April 18. After that date, restricted free agents become exclusive property of their former team.’