This is what I have been using. I was able to remove 2 Oil Coolers at a Junk Yard with it. One from a 83 300D and the other an 78 300SD.

I also have a regular 1-1/16" combination Wrench that I use on the Oil Filter End with a 24mm Combination whit the open end of the Wrenche's Head thinned to 5/16" so I can keep the Nipples from rotating.

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84 300D, 82 Volvo 244Gl Diesel