More info, some good news, some bad:
Good news: Internally, Bilstein has no oddball notes on these. What that means is this further confirms that they should be a direct bolt in with the UDSM top mounts. I have Bilstein doulbe chevking this for me, but from everything on their end, it appears that these indeed are a diect bolt in to the USDM cars. It also appears that the stock length of the shocks are the same for the GT's and the non-GT's.
Bad news: I got the compressed and extended lengths on the front struts. There is a total available travel of 108mm...not very much. That having been discovered, I wouldn't recommend using these with any springs that lower the car more than 1" With these types of front suspensions, 1" of wheel travel usually translates to about 0.75" of shock travel, so there is a bit more wheel than it initially seems, but not much.