28 mm. This seal kit includes upper wipers and lower oil seals for older Rock Shox 28mm suspension forks Judy, original Sid and Pilot.

RockShox 25.4 mm

RockShox 32 mm

Tora / Recon Silver Turnkey / Motion Control / Solo Air

32 x 10 mm, Tora / Recon / RVL / Reba

SID A1-A3 / Reba A1-A4, 32 x 5 mm

SID 35 Select C1/D1

Revelation Motion Control RC A1 (2018)