| Business | Phone |
| Apex Spring & Stamping Corp 11420 1st Ave Nw, Grand Rapids 49534 | (616) 453-5463 |
| G R Spring & Stamping 706 Bond Ave Nw, Grand Rapids 49503 | (616) 453-4491 |
| Grand Rapids Spring & Stamping 725 Bond Ave Nw, Grand Rapids 49503 | (616) 742-2686 |
| Wolverine Coil Spring Co 818 Front Ave Nw, Grand Rapids 49504 | (616) 459-3504 |