This Summa Kit Motor is suitable for a Summa S One Series. This is the original part (number 9TL89-67002).
 
This kit contains : 
3 x Cable Tie
1 x Setscrew M4x4
2 x Pulley GT3 20T
1 x Belt Tension Spring
1 x Motor with Encoder
1 x Encoder Cable
4 x Screw M3x12 
 
Printer compatibility
Summa S1 D60
Summa S1 D120
Summa S1 D140
Summa S1 D160