I bet that's what happened to you. Barton put a note in there. You're supposed to look at and measure the height of the stock reverse lock out and make sure you have the correct size by spinning the shifter.
No note, unfortunately. I may call them directly instead of going through AM.
'07 Mustang GT Alloy, 5R55S, 4.10, VMP Tune, JLT 3, Cervinis 2.5" Cowl, GT500 Spoiler/AB's, 19" Brembo Wheels, Sportlines, Koni, Hawk Pads, Kicker Audio
John 3:36 Whoever believes in the Son has eternal life, but whoever rejects the Son will not see life, for Godís wrath remains on them.