The BESTfit Charge Air Cooler 26 x 22.5 Inch, is an aftermarket cooler designed as a replacement for units on Freightliner FLA and FLB Cabover trucks from 1989 through 1999. This unit has a core size of 26 inches in height, 22.5 inches in width and 2.5 inches core depth, and it uses 4-inch inlet and outlet connections that align with common OE-style piping for effective charge air cooling. Built to original equipment specifications with a heavy-duty design, it is tested to be 100 % leak-free and comes with a warranty against defects in workmanship and materials from the date of purchase. This part replaces several OEM numbers including 01-21712-000, 01-23132-000, 01-23167-000, 01-23418-001 and related variants when dimensions and OE references are verified before ordering. You can buy the cooler sold individually or as a complete charge air cooler kit, which adds four heavy-duty clamps, two red 4-inch silicone hoses and one set of mount bushings to assist with installation. Because this is a high-quality aftermarket replacement rather than an OEM part, it's recommended to check your truck's specific fitment, OE part numbers and hose connection sizes before purchase.