What's The Steps To Assemble The Upper IBOP? We supply below spare parts: TDS-11SA IBOP UPPER OEM#110103-500 NOV Varco TDS-11SA top drive IBOP assembly NOV TDS-11SA TOP DRIVE IBOP ASSY IBOP UPPER,OEM#110103-500 IBOP,UPPER,H2S TRIM OEM#110103-502 IBOP,LOWER,OEM#114706-500 IBOP,LOWER,H2S TRIM OEM#114706-502