Standoff,SS Square SVCE
BI-30U/UG     Use Starting With Serial #4276533
              Prior to Serial #4276533 See 7016726
BI-36U/UG/UFD Use Starting With Serial #4277022
              Prior to Serial #4277022 See 7016726
BI-42UFD      Use Starting With Serial #4276195
              Prior to Serial #4276195 See 7016726