TSP is a marketing group, under the AAM group umbrella. AAM stands for automotive Accessory marketing, which represents companies with traditional names like Hedman headers. These are just marketing groups with warehouses, they have no manufacturing, none. Most all their products are manufactured in China, and Taiwan, a few in Vietnam.
TSP has a warehouse in California. If they are able to work a deal, with whomever is producing a part, and feel they can make some money, selling the part, they invest, and add to their product line.
Joe that is a nice Tbird, hope you are enjoying retirement.