There is a few threads on that but that was back in 2008-2009.

On the right side of the transmission is your transmission model number. If you posted that someone that has the same transmission might be able to tell you what filter they use.

Not a recommend to buy parts there but diesel giant used to have a pictorial on where to find the transmission number that is above the Pan on the right side.

It may not be easy to see as on mine the exhaust pipe blocks easy view.

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84 300D, 82 Volvo 244Gl Diesel