The BMW Exhaust Seal Ring Fischer & Plath 18111723531 is an OE supplier-quality component, manufactured by Fischer & Plath, part number 396.880. Engineered for precise fit and reliable performance, this seal ring is designed for the critical connection between the catalytic converter and muffler (55 mm) on select BMW models. Compatible with various BMW E34 530i and 540i (1994-1995), E32 740i and 740iL (1993-1994), E31 840Ci (1994-1997), E31 850Ci (1993-1997), 850CSi (1995), and 850i (1991-1992) models, this genuine exhaust seal ensures optimal sealing and exhaust system integrity. OE part number 18 11 1 723 531. Reference number: 18111723539. Choose Fischer & Plath for proven BMW exhaust system reliability.