mk1 manifolds usally a mk2 head ( for hydralic tappets ) if useing a bubbel block or mk3 bottom end when just doing a 1.8 - 2.0 conversion
or if doing a non gti mk1 to 2.0 tend to use what bits are avalible at the time or are withing budget usally mk1 manifolds tho on ether mk1 or mk2 head