its a pretty tight fit bud, I installed one on my old ute. Easier with a second pair of hands to drill while ones holds, but give it a go. I'm assuming its the front part you hard trouble getting in?? if so.. Pull apart the Growler airbox so you've got the access to the headlight and wires etc from the big opening, leave the airfilter etc off. When you're trying to line it up, put the left side in first (fit it around the back of the light bulb holder first). From here, you'll have to manouvre it to get the slots to line up with where you've got to drill. Its a little fiddly but you'll get what I mean when you start doin it. Also make sure to stuff all the wires etc into the opening of the airbox to keep it all out the way as its very tight. that should get the front part of it in, that's the harder part... after, you'll just have to more the airbox round to fit the other half on. This will probly be hard-up against the wheel arch, dont worry > it does fit.