In your thread (which I had already read through) you state:
post #271 - "the TCI adapter in 1/4" thick and I believe the wilcap is 1/2" or 5/8" thick."
post #391 - "I believe the Wilcap adapter is 3/8" thick"
I was just trying to get the actual measurements, since this will make a difference on how mush cross member will need removed.
Since you have the TCI, that would make the measurement 28.5"