I called about 20 dealers across KY, and every one of them told me they could order a 35 with no issues, but the 37 has to be allocated for them even to order it. A few dealers also stated the 37s were about 2-3 months behind the 35s for starting the build because they needed the extra time to iron out the kinks with the new dual valve shocks in the 37.
The dealer I ordered mine from had to get the allocation directly from their regional rep as they also couldn't order till they were given this (my) allo. It also was one of the lowest volume Fords around, which is also weird (my normal dealer is the largest volume dealer in KY, and they didn't get allo, so I am not sure how Ford is granting allo for the 24s).
My dealer also stated that when they had the allo hit their books, it had a build date already, which is, again, weird, as I still was able to customize it fully. Maybe it is worth asking your dealer to reach out to their regional rep for a precise allo/build date if possible, as it seems they are the only ones with legit info, lol