The 30459 is a permanent-magnet gear-reduction starter, a new aftermarket direct replacement engineered to match the fit, form, and function of the original starter. Specifications: - Series: PMGR - Rotation: Counterclockwise (CCW) Vehicle Compatibility: - Makes: Mercruiser, Mercruiser Stern Drive, Volvo Penta (1997-2009) - Models include: Mercruiser Model 800SCI; Mercruiser Model 8.1S Horizon; Mercruiser Model 8.1S HO; Mercruiser Model 900SC; Mercruiser Stern Drive Model 454 Mag MPI Horizon; Volvo Penta 5.7GII - Confirm exact fitment with your year, make, and model before ordering. Cross-Reference / Interchange Numbers: - Replaces / compatible with: 0170-000, 18-5603, 21129980, 30459, 3862985, 41-4304, 41-6616, 41-6793, 4304N, 4304N-USA (plus 13 more on file). Why ePartsGlobal: specialist in heavy-duty starters, alternators, and charging-system electrical parts. Backed by a 1-year warranty, free shipping on orders over $19.95, and fast fulfillment. Ships from USA.