Farnell - General Devices B-217-2
"Extension Bracket, For Solid Bearing Slides, Steel; Enclosure Material:Steel; External Height - Metric:35.05Mm; External Width - Metric:51Mm; For Use With:C-300, C-874, C-3700 Series Solid Bearing Slides; External Width - Imperial:2"|GENERAL DEVICES B-217-2"