304 Stainless steel rear air cleaner light bars, 19-1/2"H. Features twelve 2" round red LED lights with red lenses and chrome bezels. Fits Peterbilt models 1988 and newer with 15" Regular Donaldson air cleaner. Made in the USA. Sold as a pair.  

Mounting instructions: Loosen the bolts on the air cleaner straps, slip the front light bar under the loosened bolts (the notches will slip under the bolts), retighten the bolts.  

Matching front light bars, item 331793, available separately.