Labor rates vary widly within a City and even more so from Region to Region.

You might call your local Mercedes Dealer and ask the the Cost and the hours it takes; they will have a Book with the estimated time it takes to do the various repair jobs.

With that infomation you will have sort of a guide to go by.

I don't know which Engine goes into which Vehicle. Knowing that might be helpful to someone. If you call the Dealer they are going to want that info.

Also I can't tell from the Part Number but I am guessing it is the Pan on the Bottom that is leaking. If it is the O-ring between the IP and the Engine Block the IP has to be pulled back far enough to change the Ring.

If it is the Pan Seal someone here on the Forum might know if there is enough room to do that with the IP still on the Vehicle or not.

Also it is not unknow for the Cover Gasket on the side of the IP to Leak. When it does it leaks at the rear and down past the Fuel Supply Lift Pump. Someone not taking a close look might think the leak is on the bottom of the IP.
The other areas that leak are the Throttle Shaft O-rings.

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84 300D, 82 Volvo 244Gl Diesel