No to both actually.
Extended cabs have been replaced by Double Cabs, and the only box configuration available with a Double Cab is the Standard Box.
FenwickHockey65's GM Thread!
My Cars: 2003 GMC Envoy SLE, 2000 Ford Ranger XLT (State-issued)
Extended Family: 2013 GMC Terrain SLE, 1998 GMC Sonoma SLS Extended Cab