If a part is temporarily unavailable, you could substitute it with these parts:
Quality Timing cover gasket for Opel VIVARO 2.5 CDTI 146 hp Diesel
Wide selection of new timing cover gasket for Vivaro A Platform / Chassis (X83) 2.5CDTI Diesel 146 hp, priced from £7.24 to £75.96. Choose from 2 trusted manufacturers.
Tried, tested, and top-rated: Timing cover gasket for Opel Vivaro A Platform / Chassis (X83) 2.5 CDTI 146 hp Diesel