tailshaft for manual 1.6 mk1 escort!

The same as a manual or auto MK2 Escort.
 
You will likely find that given a bunch of 1 piece Escort tail shafts that the legnths vary slightly across all of them.  The is because many of them are aftermarket replacements because the 2 piece shafts were rubbish back in their day and the centre bearings werent easily replaceable like the were in say commodores.  Most were replaced by single shafts.
 
I have 3 or 4 at home and they are all different.  Different in diameter, different where the uni joint clips sit (inside or outside), some are the staked type uni's.