tdi no good as its a cable shift box, to fit also need to change clutch, flywheel and fit cable shifter unit. then either fit hydro clutch bits from abf or tdi mk3, or use cable conversion kit from SEAT ABF.
Need D or TD MK3 box, not sure about the inca van but assume it uses 020 box same as yours. note that non-turbo MK3 uses 90mm flanges, so ditting TD box would require you fit 4stud 1.8-2.0 8v or 1.9 TD MK3 shafts. SEAT inca will use MK2 wishbones so those no good either.