The Shibaura 198517105 is a genuine OEM main bearing, specifically designed as an oversize (D+0.25) replacement part. This precision-engineered bearing is critical for maintaining proper crankshaft function and engine longevity in various Iseki TX series tractors, including models TX1500, TX1510, TX2140, and TX2160. As an OEM component, it ensures optimal fit and performance, meeting the exact specifications required for engine rebuilds or repairs where an oversized bearing is necessary.