They are available seperately

part number A 015 997 94 48

Don't expect them to stock them, most techs don't change them cause they don't come with the filter. The dealer I work at only stocks them cause I buy them every 6000mi

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Alex.

MB Tech
Sydney, Australia
Volvo 122S
W201 190D 2.5 manual
W202 C240
W203 C32