For the Peach Salsa, mix the first four ingredients in medium bowl until well blended. Cover. Refrigerate until ready to serve.
Mix ketchup, 3/4 cups cider vinegar, onion, brown sugar and Marinade Mix in medium saucepan until well blended. Bring to boil. Reduce heat to low; simmer 10 minutes or until onion is tender. Set aside. Brush chicken lightly with oil.
Grill chicken over medium heat 6 to 8 minutes per side or until cooked through, turning occasionally.
Shred chicken using 2 forks. Add to saucepan; toss to coat well. Serve shredded chicken mixture on rolls topped with Peach Salsa.