Type 12
| Part No. | Diameter | Length | C to C | C to E or Thread Len. | Thread | Remarks |
| 327-443 | 1 | 7.35 | 5.75 | 4.25 | 1 3/8″-6 | GM |
| 327-331 | 1.06 | 6.58 | 5 | 2.75 | 1 3/8″-6 | Mack |
| 327-544 | 1.06 | 6.97 | 5.43 | 4 | M33 | Paccar, Use w/TB-77/81 |
| 327-346 | 1.06 | 7.06 | 5.5 | 2.75 | 1 3/8″-6 | Mack |
| 327-434 | 1.06 | 7.25 | 5.75 | 4.43 | 1 3/8″-6 | Kenworth |
| 327-537 | 1.06 | 7.38 | 5.75 | 0.66 | Kenworth | |
| 327-537 | 1.06 | 7.38 | 5.75 | 4.25 | M33 | Paccar, Use w/TB-77/81 |
| 327-305 | 1.06 | 7.4 | 5.75 | 4.5 | 1 3/8″-6 | Navistar |
| 327-540 | 1.06 | 7.83 | 6.3 | 3.5 | M33 | Paccar, Use w/TB-77/81 |
| 327-538 | 1.18 | 6.5 | 5.03 | 3.5 | M33.5 | Western Star, Use w/TB-79 |