| Business | Phone |
| Boyer Steel 19640 Charleston St, Highland Park 48203 | (313) 368-8760 |
| Factory Steel & Tubing Supply 14020 Oakland St, Highland Park 48203 | (313) 883-6300 |
| Macomb Group 15815 Hamilton Ave, Highland Park 48203 | (313) 883-2000 |
| Quality Die Casting Corp 261 E Golden Gate, Highland Park 48203 | (313) 366-6000 |