WABCO part numbers starting 556
| 556258 | Piston | WABCO | ||
| 556270 | Oil seal housing | WABCO | ||
| 556272 | Ring mating | WABCO | ||
| 556305 | Spring | WABCO | ||
| 556306 | Stem, pistion | WABCO | ||
| 556308 | Head, piston | WABCO | ||
| 556309 | Follower, diaphragm | WABCO | ||
| 556536 | Compression couling stud assembly | WABCO | ||
| 556608 | Crankshaft assembly | WABCO | ||
| 556611 | Intercooler assembly | WABCO | ||
| 556684 | Crank case | WABCO | ||
| 55673 | Fluid pressure regulating valve | WABCO |