Replacement Vacuum Pump Cover.
These parts don't really "fail" as such, but the plastic spigot is easily snapped off, especiallly when you forget to disconnect it when removing the engine...
These were fitted to Caddy, T3, and also T4 1.9 Diesels.
However, its never quite that simple...
Fits 1.6D models with a Vacuum pump with the part number 068 145 101 E.
Originally fitted to the T3 Diesels win VIN numbers up to M_105000. Thats around December 1991, so all but the last ones!
All the early 1.9s to chassis number 70_M_175 000... easy. In theory!
This lid is supplied with a seal, however its not the correct seal for the pumps its fitted to as far as the models we deal with go, so you'll need one of the seals from the related items below depending on your model/chassis number.
Nothings ever easy.