I'm in the process of removing the injectors from my 96 E300D but I found out that my deep 27 mm socket that I used on all my other diesels doesn't fit in the injector holes. The next smaller socket that I have is a 22 mm but that one seems too small. Does anyone know what kind of socket I need?

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL