Check with Eaton Detroit Spring. They manufacture here. I've had good experiences with them several times...In addition to getting the exhaust brake hooked up on my Dodge, I got my Dad's Mazda ready for inspection. It got new four new tires, two new front wheel bearings, new front brake pads, and I replaced a blown exhaust gasket. I wanted to put new front rotors on it as well but my Dad is notoriously cheap when it comes to cars and the current ones will still pass so they are staying for now. I used Timken for the wheel bearings, they seemed like the best choice between price and quality. Tires are a set of blemish General Altimax RT43s. New pads are Wagner Thermoquiets. I wanted him to get Akebonos, but these were cheaper and I've never had issues with Thermoquiets in the past. It needs a new rear coil spring; a 3 inch piece broke off the bottom of the right side a few months ago. I've tried ordering it online and from several Mazda dealers and apparently they have been on backorder for months so who knows when it might come in.
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EATON Detroit Spring
The leading manufacturer of leaf and coil springs for the street rod and restoration automotive industries
www.eatondetroitspring.com