Check with your Club Car dealer, there is a complete conversion kit available.
The dealer charges about $350-$400 for this conversion kit and it comes with a new battery bucket, wire harness, OBC4.0, component mounting plate and safety stickers.
The Club Car part numbers are:
AM1275201 - Precedent 12V TO 8V Conversion Kit - $345
103368401 - Precedent Electric Battery Bucket Assembly - $71.10
Batteries are not included.