yes you have right ,,,,,,,, i have also conformed from new parts shop in rwp who deal in nissan parts ,,,,,,,,, they said that only TD27 parts are readily available ,,,,,,,,, TD27 and TD27ti look same but there cylinder bore is different ,,,,,,,, so i think TD27 is the best swap choice ,,,,,,, and the engines which you mentioned at bilal gunj which are lying for last 8 month are useless ,,,,,,,, they are locally used in goverment vehicles ,,,,,, poorly mentained ,,,,,, and rebiuld many times ,,,,,,,,,,