3157/3156: GTR Armor (Amber) GMC the Model 170 is the

the Model 170 is the way to go

They are designed to be drop-in LED lights for truck replacements for halogen lights used in heavy-duty trucks like Peterbilt 579/587 and Kenworth T660 models

and Daytime Running Light (DRL)

so keep them dry to protect your warranty

If your XB ballasts have stainless steel brackets / tech info on the back

3157/3156: GTR Armor (Amber) GMC the Model 170 is theThe Armor Series of LED bulb: is impressively bright, with an unparalleled Black Chrome style. The white is one of the brightest bulbs we offer, and the other colors are vibrant and impressive. The Armor series look great on and off, so if you're looking for a super bright option that also looks cool, you've found the right option! Using state of the art: 2835 SMD LED chips to produce unparalleled light output with high efficiency power usage! The