The car has been offered with the length adjustable seat which makes it compatible for you. Moreover, you may visit the nearest dealership and take a test drive of the car so that you may evaluate the car on the basis of comfort, feature, and compatibility.
It is not possible to fix 7-inch infotainment system to 2016 model Tiago as the design is changed in the upgraded version. Moreover, we'd suggest you walk into the nearest authorized service centre as they will be the better person to assist you. You can click on the following link to see the details of the nearest service centre and selecting your city accordingly - Service centre
The exact information regarding the cost of the spare parts of the car can be only availed at the nearest authorized service center. We would suggest you visit the nearest authorized service center for further assistance.