Not MAJ Rob, but MAJ Gino. I was in 3 ID during the Invasion phase of OIF. The extended racks were made in Kuwait and put on the APS draw vehicles that were drawn by 1st and 2nd BDE, 3rd BDE brought their equipment from Ft Benning. 1st and 2nd BDEs included 1-64 AR, 4-64 AR, and 3-69 AR, also 3-7 CAV (DIV CAV Squadron) had them. Some tanks had them, some didn't. Can't tell you exactly which ones did or not, sorry. It would not be incorrect to have one on a draw tank though. Also, the extended rack in the Dragon USMC, Baghdad, 2003 kit is actually a 3ID version. USMC Version can be found in the new Academy M1A1 Iraq, 2003 kit.
Hope that helps.