Try ROCK AUTO, SUMMIT or KANTER. They are all in the U.S. that have good web sites and are very reliable. By the way if your 58 Pontiac is Canadian you have to ask for 58 Chevrolet springs , not Pontiac. Our Canadian Pontiac's had Chevrolet mechanical parts. Good luck.
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1957 Pontiac Pathfinder Deluxe sedan restored 261 six
1974 Chevrolet Caprice Estate wagon low mileage original 400 V-8
