I would agree with BA about Kanter, reputable and been in business many many years.
1966 Impala SS
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By the way Speedway has a catalog full of roundy-round car parts that use B-body control arms and other suspension parts from the full size and light pick-up truck lines for use in mid sized race cars (circle track) so they have a lot of HD Impala parts that can be addapted to your rebuild if you recognize the part in the catalog for what you are looking for.