Frequently Asked Questions About Peterbilt 359 Cab, Sleeper & Cowl Panels

Will these panels fit my specific year Peterbilt 359, and what about 379 compatibility?

Our Peterbilt 359 panels are designed to fit 1967-1987 model years. While the 359 and 379 share similar styling, they have different mounting points and dimensions. The 379 has a longer hood and different cab measurements, so 359-specific panels will not properly fit a 379. Always verify your truck's model number on the door jamb sticker before ordering to ensure proper fitment.

What gauge steel are these panels made from, and how do they compare to OEM?

Most aftermarket replacement panels are manufactured from 16-18 gauge steel, matching or exceeding OEM specifications. Quality panels feature proper stamping depths, correct body lines, and reinforced stress points. We recommend checking individual product descriptions for specific gauge information, as some economy options may use thinner material that can be more prone to vibration and premature wear.

Do I need to drill new holes, and what modifications are required for installation?

Quality replacement panels typically use factory mounting locations, but some drilling and trimming is often required for precise fitment. Common adjustments include elongating mounting holes, trimming edges for proper door gaps, and occasionally welding brackets for accessories. Professional installation is recommended for sleeper panels and complex cowl replacements, while experienced DIYers can handle most standard cab panels with basic tools.

Are these panels available in stainless steel, and do they come primed or painted?

Panels are available in both mild steel and stainless steel options. Mild steel panels typically come with a black primer coating that requires painting before installation. Stainless steel panels are available in brushed or polished finishes and don't require painting but cost significantly more. Some vendors offer pre-painted options in common colors, though most customers prefer to paint-match locally for best results.

What's included with cowl panels, and will I need additional hardware?

Cowl panel sets usually include the main panel pieces but rarely include mounting hardware, rubber seals, or trim pieces. You'll typically need to purchase separately: mounting bolts, rubber hood-to-cowl seals, chrome or stainless trim strips, and any grommets for wiring pass-throughs. Budget an additional $50-150 for these accessories depending on whether you're reusing existing hardware or replacing everything.