Completed 23 March 1955, 550-0029 was a white Spyder with red darts ordered by West Coast orthopaedic surgeon Dr. Troy McHenry. Debuting at Hansen Dam, Los Angeles on 18 June, McHenry regularly placed 3rd or 4th throughout 1955–56.

Following James Dean’s fatal accident, McHenry fitted suspension parts from the wreck of 550-0055, sourced from Dr. William Eschrich. At Pomona in October 1956, steering failure on lap one sent him into a tree, killing him instantly.

The car was later bought and repaired by Scooter Patrick, fitted with what appears to be an RSK nose and renamed the Adam Mitchell Special. Patrick raced it across California and Colorado through the 1961 season.

Chassis #550-0029 has a documented race and ownership history that has been researched and verified through primary sources. Accurate provenance information for this car is available upon enquiry through the contact page.