| Business | Phone |
| Suhm Coil Spring Works 2402 Broad St, Houston 77087 | (713) 643-1855 |
| Southern Spring Mfg Inc 915 Pinemont Dr, Houston 77018 | (713) 692-7191 |
| Spring Engineers 9740 Tanner Rd, Houston 77041 | (713) 690-9488 |
| Spring Products Intl 5930 Thomas Rd, Houston 77041 | (713) 937-7282 |
| Roc Carbon Co 1605 Brittmoore Rd, Houston 77043 | (713) 468-7743 |