Needing to change the pre-filter on my 300SDL ...on-line sources as well as my local Benz dealer only have a filter whose both ends are straight...the dirty one on my car has one end with a 90 degree or L shape to it. Is this a change? Has anyone here replaced the L shaped one with the straight one? Please advise...Thankful for any replies!

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2001 E320 4matic, 2003 E320 4matic wagon