| Part Number | OEM Number |
| BN-953L | Front OE# A 211 490 23 14, Rear OE# A 211 490 08 14, 2 bolt in, 2 bolt out, one sensor 21/2" below flange, one sensor 4" below body |
| BN-953R | Front OE# A 211 490 24 14, Rear OE# A 211 490 09 14, 2 bolt in, pipe outlet, one sensor 3" below flange, one sensor 3" below body |