Yes, they can be used with a Showa shock.
1091-31 is the Ohlins code for a 160mm (6.3 in) long 57mm I.D. spring having a spring rate of 95N/mm (542 lbs/in). Suitable for a monoposto rider+gear weighing more than 265 lbs. or a biposto rider+gear weighing 235-245 lbs.
where:
/95 = 90N/mm stiffness
L090 = production batch number
1091-29 is the Ohlins code for a 160mm (6.3 in) long 57mm I.D. spring having a spring rate of 90N/mm (514 lbs/in)
Suitable for a monoposto rider+gear weighing 245-265 lbs. or a biposto rider+gear weighing 220-235 lbs.
where:
/90 = 90N/mm stiffness
200 = production batch number
The following table lists the Öhlins rear springs for Ducati applications and rider weights:
