Any R8 collet can be used to match the inboard side of your arbor.

Mill Machine Parts R8 Spindle + Bearings Assembly Fit BRIDGEPORT Milling US Product description: This product is a high quality R8 spindle + bearing for 3#4# milling machine. After the spindle is replaced, it can change the surface or side of the milling workpiece caused by the tool wear caused by the long wear of the spindle and the bearing clearance. Smooth, rough and uneven! Product specifications: Name: Milling R8 spindle + bearing Total length of the spindle: 545mm Head outer diameter: 46mm Spline outer diameter: 25mm D:25mm D1:20mm B:6mm Bearing position: 35mm and 30mm Packing size: 561010cm Weight: 4.2kg Scope of application: Most milling machines (3#4# milling machine) The package includes: 1X R8 spindle + bearing.

Nice Emco Concept 55 CNC Mill. Pulled from a vocational school and has not been run in a few years. Includes a desktop and monitor with WinNC installed. No hard copies of the software. Includes the USB control board. Only what is shown is included.