SKF linear motion products in this category differ from rotating bearings: the request starts from travel along a rail or shaft. The catalog lists LBC part numbers and units from other series. To identify a replacement, you need to know the moving part, its guide and which portion of the assembly is being replaced.
A diameter or an outside photo is not enough. Keep the leading letters, the numeric section and any added designation block. A photo of the unit on its guide links the marking to how it is installed. On a machine with several axes of motion, treat each position separately so part numbers from different assemblies do not get mixed.
Send the full part number, the quantity and photos of the component, its markings and how it is fastened. Add verified dimensions, the application and a parts drawing if one is available. Make clear whether you need a guiding component or the complete assembly. For a different configuration, describe the travel and the intended mounting from the equipment documentation; looking alike on the outside does not mean two units fit the same installation.