Actually the Tensioner top nut is the same part number as DEEZ Nuts:
Stabilizer Bar Nut, Power Booster Nut, Top Assembly Nut, Bracket Nut, Drive Shaft Nut, Spare Carrier Nut, Mount Bracket Nut, Shifter Assembly Nut, Upper Hinge Nut, Fuse Nut, Water Pump Nut, Alternator Nut, Front Mount Bracket...