Table:
text: Cosworth
Early types
Early types
Type_ Year_ Block Displacement Mainly_For
Mk.XIII 1963 116E 1594 cc Formula B , Lotus 22 , 23B , 23C
Mk.XIV 1963 116E 1498 cc Lotus Mk.VII
Mk.XV 1963 116E 1594 cc Lotus 26R, Lotus Cortina
Mk.XVI 1963 116E 1498 cc Note
Mk.XVII 1964 109E 1098 cc Formula Junior
MAE 1965 109E 997 cc Formula 3

text: Cosworth
Early types
Early types
Type_ Year_ Block Displacement Mainly_For
Mk.I 1959 105/107E 997 cc Development of A2 and A3 camshaft
Mk.II 1960 105/107E 997cc Lotus Mk.VII
Mk.III 1960 105/107E 997cc Formula Junior
Mk.IV 1961 105/107E 1098 cc Formula Junior
Mk.V 1962 109E 1340 cc Lotus Mk.VII
Mk.VI 1962 109E 1340 cc Lotus Mk.VII
Mk.VII 1962 109E 1475 cc 1.5 Litre class
Mk.VIII 1963 116E 1498 cc Lotus Mk.VII
Mk.IX 1963 116E 1498 cc 1.5 Litre class
Mk.X 1963 116E 1498 cc Development of Mk.XII and XIII
Mk.XI 1963 109E 1098 cc Formula Junior
Mk.XII 1963 116E 1594 cc Lotus 20B , 22 , 23

Question: What is the primary for 997cc displacement in a year prior to 1962 in early Cosworth types?