Due to the modular nature of the SMW Mod Vise, upgrading your single station vise to a dual station at any time is simple. Generally, this requires buying an additional adjustable-side of the vise and the dual station center jaw - the following is a complete parts list for convert your single station vise to a dual station. Note: parts that are size specific are noted as such (e.g. 1/4" or M6, 1/2" or M12). If not noted, parts are identical between the metric and inch vises. For Hobby Vises: (1) 1/4" or M6 Adjustable Side Base (1) Hobby Dual Station Top Jaw (1) Gen2 Clamping Hardware Kit (4pc.) (1) 1/4" or M6 Mounting Hardware Kit (Single Station) (2) Reversible Jaw Inserts (optional) (4) 10-32 Castle Grips (optional) For Gen2 (1/2") Vises: (1) Gen2 Adjustable Side Base (1) Gen2 Dual Station Top Jaw (1) Gen2 Clamping Hardware Kit (4pc.) (1) Gen2 Mounting Hardware Kit (Single Station) (2) Reversible Jaw Inserts (optional) (4) 10-32 Castle Grips (optional) For Gen3 Vises: (1) 1/2" or M12 Dual Station Fixed Side Base (1) 1/2" or M12 Adjustable Side Base (1) 1/2" or M12 Mounting Hardware Kit (Single Station) (2) Smooth Jaw Inserts (optional) (4) M5 Castle Grips (optional)