The bosses with the holes that are threaded will be in the wrong location for the short injector.
Grind them off for appearance sake.
First get the new short injectors.
Drill the rail stock to fit the injectors.
Install injectors #1, #3, #4 #6 with the rail onto the intake manifold.
Make two brackets (chunks of aluminum) that bolt to the side of the rail and extends down to intake runners #2 and #5.
The brackets need to be wide enough so the 2 mounting screws straddle the holes for injectors #2 and #5 in the rail.
Curve and angle the brackets other end so it fits the curve of the intake runner and weld them to runners #2 and #5.
Did you get the new turbocharger?