Alright, if you're dealing with an oil leak at the front of your engine, especially on a VW or Audi with a 1.6L or 2.0L TDI, this crankshaft oil seal flange could be your fix. The part number you're looking for is 04L103151 (or 04L103151A). It's a direct OEM replacement made from PA66 material, which is a tough, durable plastic/nylon that can handle the heat and chemicals in your engine bay. It's a pretty small part (weighs about 0.3 lbs) but super important—it seals where the crankshaft sticks out of the engine block, keeping the oil in and dirt out. Replacing a worn-out one can stop leaks, prevent damage, and just keep everything running smooth and quiet. Make sure this matches the exact part number you pulled off your old one or what your repair manual calls for. It's one of those 'fix it right the first time' kind of parts.
