The above boat trailers were built by Hunter Marine. Although most boat build lists are available, there are none on the trailers which used standard trailer parts easily obtained at trailer supply business. As for the size of bearings, they are 1.98 inches sometimes referred to as 2 inch. I would suggest you get the cup covers with bearing grease fittings unless the axle is designed differently for adding grease. I would also suggest Marine grade compatible grease
