I looked around a little I am unable to find a part number for the tubing.

You will need to go to the Dealer, or go to the parts tab at Fastlane and on the left side you will see how to contact Phil.

Also what side of the Engine is the leaking tubing on?

There are some DIYs on replacing the tubing.

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84 300D, 82 Volvo 244Gl Diesel