This clutch slave cylinder hose clip fits early Vanagons that use a rubber hose at the rear of the clutch pipe. 

This is typically 1980 through chassis number 24-F-079099 (Mid-85) and early Syncros through 24-F-175000 (85).

Fun fact:  Your chassis number is usually the last seven digits of your VIN number.

Ref ID: 251721488