Your shifter is either missing the gate plate on the bottom or it is broken. The gear lever would not be able to be put into the position below 5th with that in place and intact.

All the clutch hydraulic parts for all years are the same or have been superseded at least for single-mass flywheel. I'm unsure about dual. I had a friend who did a manual swap on his W201 have this exact issue you describe not long ago. We bleed his clutch again, but only minimal bubbles came out and no change. I uninstalled and reinstalled the trans and clutch to make sure he didn't do anything incorrectly and found no errors, but when we put it back together the clutch worked properly. Did you use the correct bolts for the pressure plate with the thick lock washers?

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