AcuraPartsWarehouse.com offers the lowest prices for genuine 2018 Acura TLX parts. Parts like Rear Knuckle (4WD) are shipped directly from authorized Acura dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Body & Trim: 4 Door TECH+A (A-SPEC AWD 19 R). Emission & Transmission: KA 9AT.