Rubber grommet, used on various applications across the VW range.
Some Examples
Beetle: where the fuel flexi Pipe meets the Body
Baywindow: where the fuel line runs through the tinware
Transporter T4: where the hydraulic hose runs under the pedal Cluster through the body
23.5mm / 6mm-18mm centre
Beetle 1950-1979 & Beetle Cabrio 1950-1979
Karmann Ghia 1960-1974
T2 Bay 1968-1979
T4 1991-2003
Type 3 1962-1973