Any website selling the aftermarket reverse sensing systems?

Such as the Poron one?

 

www.jcwhitney.com and www.harborfreighttools.com

 

I've seen some on Ebay as well. Some are cheap **** 1 or 2 sensor jobs and some look like decent 4 sensor systems.

 

I installed the Parking-E 4-sensor system and love it.

I did a lot of research, and it appears to be the only one providing measurements down to 12" visually. Most of the others give warning beeps, and go to a solid beep at about 3'. Usually when I park, I'm closer than 3' to whatever I'm backing up to.

This thread has some great info.

Great Reverse Sensor Link

Here's a link to pix of my reverse sensor installation.
Parking-E system

And here's where I bought mine -- I think it's the best out there.

Stratus Group Site (Parking-E)