Battery Tender Cable Extensions
.....Sometimes.....when you buy 2, 3, or 4 prong flat trailer plugs they come in one complete length connected on both ends so you can cut them to what you need. I have found them this way at Wally World before. Look before you buy, but if so...they should work too. Might be cheaper too.
"In 3 words I can sum up everything I know about life: it goes on" Robert Frost
"If I knew where I was, I wouldn't know where I was going!" ODDA