Comparison : Item # 01-54-20, 54 Series: .125 Board Hole x .125 Chassis Hole
Item # 01-54-30, 54 Series: .125 Board Hole x .125 Chassis Hole
Item # 01-54-40, 54 Series: .125 Board Hole x .125 Chassis Hole
Item # 01-54-50, 54 Series: .125 Board Hole x .125 Chassis Hole
Item # 01-54-60, 54 Series: .125 Board Hole x .125 Chassis Hole