2299001587 schumacher heatsink rectifier assembly, Heatsink rectifier assembly, requires soldering to install. caution should be used when installing this product and care taken to insure over heating or shorting does. 0499000051 schumacher 6 position rotary selector switch, 0499000051 schumacher 6 position rotary selector switch (7 terminals with trace). uses newer "twist lock" mounting system for newer units. if your unit has an older.