BN-620A/BN-620B/BN-620C/BN-621A/BN-621B/BN-621C/BN-621D/BN-621E/BN-621F/BN-621G/BN-621H
| Part Number | Inlet/Outlet | Sensor | Body | OEM Number | Additional Info |
| BN-620A | 1 3/4" pipe outlet | w/out sensor | 14" body w/out shield, 16" body w/shield | ||
| BN-620B | 2" pipe outlet | w/out sensor | 14" body w/out shield, 16" body w/shield | ||
| BN-620C | 3 bolt step down flange inlet, 1 3/4" pipe outlet | sensor behind flange on inlet | 14" body w/out shield, 16" body w/shield | 357131701CAFT | 10 3/4" length from weld to weld |
| BN-621A | 3 bolt inlet, 2" rear pipe | sensor in front of body | 18" around body | 165131701C | w/donut gasket |
| BN-621B | 3 bolt inlet, 2 1/4" rear pipe | sensor in front of body | 18" around body | 165131701 | w/donut gasket |
| BN-621C | 3 bolt inlet | w/out sensor | 18" around body | w/donut gasket | |
| BN-621D | 3 bolt inlet | sensor in front of body | 20" around body | 535131701 | w/donut gasket |
| BN-621E | 3 bolt inlet | sensor on outlet of body | 20" around body | w/flat gasket | |
| BN-621F | 3 bolt inlet | sensor in front of body | 20" around body | 353131701R, 535131701B | w/flat gasket |
| BN-621G | 3 bolt inlet | w/out sensor | 16" around body | 028131701B | donut gasket |
| BN-621H | 3 bolt inlet | with sensor | 11" body length | 13571, 1HM131, 701HAFT | donut gasket, 8" rear pipe |
Specify the following: OEM# required; number of bolts in flange; center bolt measurement if a 3 bolt flange; number of sensors; location of sensors; flat or ring gasket; rear pipe size; size around converter body (not length)