This is a discussion on Sliding sub box within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; Go buy a rear strut bar and some 6 inch zip ties from Home Depot. Install the strut bar, which ...
Go buy a rear strut bar and some 6 inch zip ties from Home Depot. Install the strut bar, which is awesome in its own right, and than screw a few eye hole screws and zip those to the strut bar. Easy fix without any extra grief.
It's going to be slightly different depending on what shape/size/etc your box is, but like a poster above mentioned, L brackets are usually your best bet if you plan on keeping it there for awhile. Your local hardware store, or Lowe's/Home Depot/etc. should have plenty of L brackets to choose from.
I personally used just two L brackets on each top corner where my box meets my trunk wall... 1 1/2" L brackets and a few self-tapping screws and it doesn't go anywhere, plus the brackets are hidden quite well and like said above, i can simply just roll the bottom of the box back to get my spare if needed.
2006 SGM STi
the gas tank is well below the 1/8" long screw you would use. you only need to go into the floor board of the boot. dont know about your car, but my protege 5 has a wood boot board about 1/4" thick. just find something short and grab a few of them. you could also try this:
Spare Tire Sub Box - Team Integra
you would have to carry your spare off to the side and doesnt look that great, but you save A LOT OF SPACE and functionality of your boot as well. get some nice carpet that matches everything, and you have a sub that is a part of your car instead of sitting in your boot. it adds a lot to the SQ of the system as well. comparison: a door speaker hanging from your window, or in the door frame like the stock comes with. which would you think would sound better?
it doesnt matter if its bolted down, its pretty much form fitted to the trunk area. i think he just wants something to prevent the box from moving around in his trunk when cornering hard