I have a 1976 W115 240D. The Idler arm pulley is starting to make a noise in the mornings at start up. I have ordered a replacement INA pulley from 2 different vendors. I keep getting a 9.5 mm diameter pulley but the pulley on my car is a 8 mm diameter pulley. The part number I receive is 535 091 200. Has anyone ever had this problem? I don't know how to proceed to get the correct size.

Thanks for the help.

Can the bearing be pressed out on that vehicle> If so, you can source a higher quality bearing and press it in.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

Possibly you can specify to your vendors that you specifically need an 8mm diameter pulley.