As noted in the linked thread above (if you can decipher the text), I put a 5 speed in my '74 X. In my case I retained the 1300 engine.
To make the sway you need the following 5 speed parts:
flywheel backing plate (dust shield)
5 speed flywheel
5 speed starter
5 speed shifter
5 speed shift linkage rod (from the shifter to the exit of the tunnel)
5 speed CV axles
5 speed uprights (hub carriers/knuckles)
Notes:
The 5 speed struts had a different lower mount that provides for more CV clearance but I have not had any issue using the 4 speed struts with 5 speed CV axles on mulitple cars.
The 5 speed, driver's side, lower control arm, has a bend for additional clearance of the 5th gear extension housing on the transmission case. You can easily trim a few mm's off the control arm for additional clearance if you don't want to replace the control arm.
The slave cyclinders are the same but the hoses are different. I have seen people use either hose.
You will need the 5 speed slave cylinder bracket.
Finally, the 5 speed chassis had a dimple in the inner arch of the main chassis rail to clear the 5th gear extension housing. The 5 speed fits the 4 speed chassis but its very tight. A couple of pops with a 2 lbs sledge worked for me. It didn't take much.