Installation can be simplified with the right adapter, this 12-inch billet aluminum seat base adapter is designed to mount Seats Inc. Legacy LO seats in compatible Kenworth W900-series trucks. This adapter converts the factory floor bolt pattern so drivers can replace an OEM seat without drilling new holes in the floorboard, while also providing additional legroom compared to the original seat position. The 12-inch-wide base plate is constructed from billet aluminum for strength and durability in heavy-duty use, and it is designed for Legacy LO seats manufactured after July 1, 2018. A pre-drilled hole for Kenworth airline fittings is included to help maintain proper air seat connections during installation. Fitment covers Kenworth W900A, W900B, and W900L models across multiple years, including Aerocab versions. Each adapter is sold individually as a high-quality aftermarket replacement and comes with a warranty against defects in materials and workmanship from the date of purchase.