Cross Reference: Previous Part # 7007054. Fits Models BI-30U/UG BI-36R,BI-36U/UG, BI-36RG,BI-36S,BI-42S,BI-42SD,BI-48S, BI-48SD,IC-27R. FOR BI-Series Use Regardless Of Serial Number However Prior to #4123687 Criper Magnet Must Be Removed For This Slide to Fit. NOTE: Prior to #4123687 Also Order LH Slide. FOR IC-27R Use Regardless Of Serial Number However Prior to #3168560 Criper Magnet Must Be Removed For This Slide to Fit NOTE: Prior to #3168560 Also Order LH Slide