The "standard" 17" outers have a 15.470" ID.

(The 17" "custom" have a 14.228" ID, which is the same as a 16" large ID outer)


US Wheel has just got their own machine to roll outers, so not sure if they will go to a unique size or not.... (mainly since getting them from Carlstar like most of us did is harder for a while with their production leaving SoCal)