Heres my toolbox. Its a normal one, designed for Dakotas/Tacomas not Rangers/Canyons.
Its probably wider then you are looking for tho. its about 1.5' wide. its also about 3 inch father out since the backrack to.
It is easy to take out to, 2 bolts and 2 Self-tapping screws. It came with J bolts to secure it to the rails without drilling.

 

Here is my box. It is an old knack game box that I sanded down and painted. It works real well with the roll bar and holds plenty of tools. Also, they are harder to break into for the most part than a regular truck box.
truck8.jpg

 

I went with an Undercover Swingbox:
http://www.undercoverinfo.com/new_models_sc.php

I paid 190 locally and they installed for free.

 

IMG00318-20110420-1321.jpg

 

Kind of like mine? It's not the best picture in the world, I'll get out there tomorrow and snap some better ones.

040-1.jpg

 

anyone else notice the monster and shotgun shell in that pic too?

 

this is the one i was talking about

 

Yes , i will see if i can use 2 of them so i fill the bed

 

Anyone have the Mopar box and drops into the Mopar utility rails? Been thinking about getting one as I already have the utility rails and it would fit under my roll cover and been easy to remove if needed.

Not too keen on the price though, $550.

http://www.mopar.com/part/82211355?s=290526&i=275377