Choose Options Peterbilt 579 DEF Fill Area Trim By RoadWorks RoadWorks MSRP: Now: $34.95 Was: Peterbilt 579 DEF Fill Area Trim Fairing DEF Fill Area Trim Fits Peterbilt 579 Models Sold Individually Quality American Made Product The fairing DEF fill area trim is designed specifically for Peterbilt 579 models. It is sold individually. If you... MSRP: Now: $34.95 Was: Choose Options