Getting a stock of new and rebuilt trailing arms together...
https://www.corvettekingdom.co.uk/part/65-79-rear-trailing-control-arm-assembly-left-with-sway-bar-bracket-holes-w-original-trailing-arm-spindle-no-rotor-nd/16169
https://www.corvettekingdom.co.uk/part/65-79-rear-trailing-control-arm-assembly-left-with-sway-bar-bracket-holes-no-rotor-nd/16025