It's likely that you do have the late 86 Getrag slave. It's shorter and stubby and has the studs pointing toward the drivers side of the car. The pushrod is shorter, too. The 4-speed is longer, has a longer pushrod and the mounting studs are bradded into the flange and point to the passenger side. The proper pushrod should be about 5 3/4 inches long.
The differences in the 2 master cylinders is that the fluid line attaches either behind the reservoir or in front of it. You can tell if the wrong one is installed because the fluid line would have to be re-bent.
The banjo rod should most definitely have the curl. Maybe they just used whatever they had lying around from another car.
In your case, when ordering clutch system parts, you should ask for 85 GT 2.8
parts. It helps to eliminate getting the Getrag parts.