I don't know if this is correct or not, but it's the one that came with my Barracuda.
There were 3 different rods. Maybe we can add some lenghts to the parts.

2964744 - Standard Tire Spare 10.5"
2964999 - Space saver (23 & 29) 6.5"
3444581 - Space Saver (27 - Convertible - All Challengers) 9.5"