Obviously depends on the rules that are being played, but I think there are quite a few OTs in free agency this year:
Tyson Clabo, Doug Free, Matt Light, Jermon Bushrod, Willie Colon, Ryan Harris, Marshal Yanda, Jeromy Clary, Charlie Johnson and Ryan O'Callaghan could all be UFAs and be an immediate upgrade at RT.
I like D Bell at LT.