I actually contacted a couple companies about the Y55, and asked if they would reproduce one. I was told that there is just not enough demand to retool and make them.. I always refer to them as reverse post. Reverse polarity to me, never sounded right, sounds like a positive ground thing, or similar. Like you are changing something. JMHO... The polarity isn't being changed, just the posts are being switched, right? Still a 12 volt negative ground. Just happens to be moved to the other side. Danny