| Part Number | Inlet | Outlet | Length | Additional Info |
| BN-729A | 2 bolt formed flange w/3" opening | 3 bolt flat flange | 33 1/2" | w/out sensor |
| BN-729B | 2 bolt formed flange w/3 1/4" opening | 3 bolt flat flange | 33 1/2" | w/out sensor |
| BN-729C | 2 bolt formed flange w/2 3/4" opening | 3 bolt flat flange | 7" rear pipe, 1 sensor in rear pipe | |
| BN-729D | 2 bolt | 3 bolt | 33 1/2" | 1 sensor in body 8" below 2-bolt flange |
Need measurement across front flange opposite bolt holes