NGER BRACKETS in accordance with STC No. SR00235AT. Installed BHT serviceable Lightweight Popout Floats in accordance with BHT-407-11-1. Installed BHT Drive Train Modification Kit, P/N 407.704-012-115 in accordance with BHT-407-II-30. Weighed aircraft and computed new weight and balance. Revised flight manual equipment list.