How about you give the freaking link?! That really would help, instead of just telling people to go try to find something on the internet and hope it's the same thing you are talking about.
I just did some digging for a while on EVSEAdapters' site, and I think I found what you are talking about, but no guarantees. Is this it?
www.evseadapters.com
They have several lengths that say they are not for Superchargers, and then the 14 foot one, which does say it is specifically for Superchargers. It says it is out of stock right now. I hadn't heard of anyone making a Supercharger extension cord before, but if anyone could do it, I would trust EVSEAdapters to be the ones to make it well.