Peterbilt Radiator Tank Assembly Top Surge Tank 379 OE#'s 0706602 0706657A031 Peterbilt 379 Bolt On Top Tank Assembly Surge Tank Limited one-year , Unlimited mile, Nationwide Warranty Dimensions: 24 1/4 X 12 1/2 X 3 3/4; Bolt On Top Tank Dimensions: 37 1/2 X 6 1/2; Bolt Holes: 42; Gasket: GK1809 - Included! High Quality, Direct Fit Replacement for OEM Numbers Listed FREE SHIPPING!