On last year's Chokoloskee to Flamingo trip, Marty Cooperman had a used 2015 AI 2. Unfortunately, it did not have the newer 2015 mirage drive. Rather it had an older drive, and it just did not fit. Marty spent the whole trip trying to get it to fit his 2015.
You can read about it here, http://www.hobiecat.com/forums/viewtopic.php?f=70&t=7276&start=855
I don't know the year of the drive that did not fit, but, fortunately, when Marty contacted the person from whom he purchased the 2015 AI 2, the person sent him a brand new drive. Nice.