8x20mm. PartQualifier: 8x20mm. Support bracket bolt. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Differential Housing Support to it's mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Floor Pan Heat Shield to a mounting point. Door Check Bolt. AND WASHER. bracket. Differential Housing. Door Check. Floor Pan.