The non-USA Distributor in it’s original form for those on a budget. A badly needed replacement for the 1974 and earlier engines with the “backwards” distributor. You will feel an immediate horse power gain. Later models will gain from the 42o advance. Quicker take-off and easier starting. 7709 and later models must purchase the TPI gel coil and resistor kit #19500ADV. 8008-up models must purchase the clamp #19905. Factory plug wires will work but the non-USA plug wires will fit better #19901ADV. Distributor is a simple drop-in and ready to go.