If it is for the TD5 I think you need a 1.2
I rebuild a lt230 1.6 to a 1.3
Mounted it after a lt77 + 300tdi, the 5th gear is now really an overdrive and doesn’t like going less than 60km/h (<40mls/h)
A 1.4 runs smoother I think, a 1,6 would not be advised because your max speed will be to low...