| Manual windows might be a good thing as you won't have to worry about window regulators or switches going out.
I'm fairly sure that the Canadian bound W124s had the same equipment levels as the US, except for the km/h speedometer which was a regulatory requirement.
So as long as you see at least 2 fuel filters in the engine bay, and you use a fuel additive (due to ultra low sulfur fuel these days) with each fill up such as Red Line diesel fuel catalyst this might be worth a shot.
I would recommend you find yourself a source for the unique stuff like the climate control system for the day you need it. Jonathan said in a previous he can get anything you need.
I think the 5-speed is the same unit as the ones that came in the early M103 engined US bound W124s. | 
