The Curt number is 56090. I got a Hopkins, don't know the number. Probably have to get over the Web or in a specialty tow shop, since the typical trinket stores (Tractor Supply, O'Reilly's, AutoZone) don't have it and they don't know what it is. You are looking for a converter that takes the separate turn/brake circuits (3) of the Transit down to the combined brake/turn circuits (2) of the trailer, but WITH an additional hot (battery) wire to supply the trailer lights, so that the trailer lights do not get powered through the Transit's turn signal circuits. The Hopkins kit was very nice, with a 20' 14 gauge battery wire. I ended up buying 20' of flexible plastic wire-covering to protect the wire and routed it through the passenger compartment, under rugs, etc. up through the firewall through one of two handy firewall rubber grommets which then feeds right into the engine compartment near the battery. Of course, you also have to locate the taillight/brake circuits in the back, which directions I think are available on the web if you google it (I did not do this part, so I can't help). Plan on spending about $100 and a couple of hours.