I have Ford Aspire which doesn't come with parking sensor in any variant. It has shiny maroon bumper which I don't want to drill for these sensors.
I searched on Google to find any alternative way and finally I found electromagnetic parking sensors rather than using traditional electroscopic parking sensors.
I looked for this sensor in market but it is not available. So I again googled for it and finally I found it on Buy Electromagnetic reverse car parking sensor, no holes in bumpers Online in India - 83686326 - ShopClues.com
Some basic things I want to share with you guys which I came to know about electromagnetic.
In Electromagnetic parking sensor kit, there is an adhesive metal tape which sticks inside the bumper which works as an antenna. It gets stick from start to end of the bumper so its coverage is 100%. It is connected to a buzzer which beeps sound at three frequencies at three different levels. First at 3 feet and 2 feet and 1 feet far from the object. Good thing about this sensor is it can be connected to any vehicle no matter front or rear bumper. It just need 12v DC power which common all the cars.
So I installed it on both the bumpers. One smart thing I done is, I have given power to parking sensor in front bumper by fog lamp so whenever I need parking aid I just turn on fog lamp and parking sensor get activated. By doing this I can save myself from unnecessary alerts.