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| BN-573C1 | BN-573C2 | BN-573C3 |
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| Part Number | Sensor | Additional Info |
| BN-573C1 | w/out sensor | |
| BN-573C2 | w/sensor | |
| BN-573C3 | w/out sensor | center bolt measurement is different than C1 & C2, Ring gasket |
| Measurements Required |
| number of bolts inlet; square or off set front flange; with or w/out air; with or w/out sensor; with or w/out manifold; round or oval body |