Throttle cable

Hi all I brought a throttle cable through Ebay for a 68 dart with a 383 and its about 3 inches too short at 17 inches. Can anyone confirm the correct length and where to buy one, the one removed was about 24 inches and a tad too long. I have found this one which I reckon will fit but the site says it doesnt so i dont want to commit and have two cables which dont fit...cheers

http://www.ebay.com/itm/ATP-Y155-Ac...pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr