Hi-even I have a swift and faced the same problem of reversing & parking.I have fitted a reverse parking sensor from Xenos(Pricol company) @ Rs.3500 and really find it very useful.now I dont have to turn back to see the distance between the bumper and the obstacle when reversing.
I got 4 sensors mounted on the bumper and an indicator placed in front of the driver which indicates the distance to the obstacle and to which side the obstacle is.
at a distance <0.3 m it gives rapid beeps and warns you.
I found this product to be real value for money.
By the way you have models for every car.
I got this free when I fitted xenos power windows(2 door)for my Lxi Swift @ Rs.5750 at the lifestyle exhibition in chennai in 2006.
URL
https://xenos.co.in/VehicleConvienenceRange_ReversingAid.html
Hope you guys find this useful
G.Balaji - Mysore