The Universal SIngle kit is not specifically made to fit any vehicle, so fitting it to your 4Runner would be up to you to determine. The dimension of the tray, including the overall height with the smart isolator, is 10.5 Inch High and 7.375 Inch Wide. The base of the tray is 11.25 Inch Long, and the overall length including the tabs at the top for securing the lid is 12.75 Inch Long. This particular kit is only the battery tray, lid, and busbars. For a fully functional dual battery setup, see below.
https://www.genesisoffroad.com/universal-single-battery-kit