LiFeP04 3-phase lithium compatible digital MOSFET regulator/rectifier. Can be used with field coil or PMA system. Complete with wire harness. If your reg/rec is 20+ years old, you should consider replacing it, especially if you're considering a lithium battery. 
 
Lower 14.2 voltage set point that is optimized for lithium iron phosphate (LiFePO4) batteries and won’t shorten their lifespan by low level overcharging
MOSFET technology produces much less heat
Waterproof connectors