[x33rs]

I made my Y55 just like that, and even added a warranty sticker my wife found.

I did have to modify my topper for the reverse polarity though because I actually have a (correct for my car) reverse polarity battery in the car (Napa still sells them)
I couldn't switch the battery because the little ground wire off the negative cable screws to the core support next to the radiator cap, not the fender as they did later in production. It's not long enough to move the battery cable to the other side of the battery.