Measuring with the calipers gave me around ≈25mm.Spring and MCU is 1997 Type2 era, before full spring in 1998 and after Multiple MCU in 95/96.
A full fork picture would help.
Anyway got Type2.
Indy will be 115mm
Judy will be 100mm unless Long Travel and then they are 115mm.
If they are over 6mm shorter then they need replacing.
Diameter is 18mm* (might be different as I'm not sure, just measure the caps etc to check.)
That could be single full length solid Indy elastomer? Could be 22mm?