I've had one of those pieces from Brent. Pretty simple. It allows use of the tailhousing bushing and output seal from the Sami trans to be used in the back of the Trackick/Vitara maual or automatic. It's really cool too. He developed it for his Sami pickup that has a GV 2.5 V6.
Cool score on the 1.3 Kick! Suzuki offered that exact model simply as a very cheap 4X4 to get people in the door, the dealers normally upsold to the 1.6 version. That is why not many exist. They were built all through the '89 model year.