http://www.classicparts.com/1953-54-Wiring-Harness-Generator/productinfo/52-025/

or

http://www.classicparts.com/1953-54-Wiring-Harness-Alternator/productinfo/52-026/

This is what I bought for my '54 and it was perfect. No reason to spend hundreds of dollars on these things unless you're adding circuits or upgrades.