titan fridge slide

Hey fellas, I have recently acquired a 60L Engel and a fridge slide from supacentre. Has anyone installed one directly into a ute tub? I had a crack today but I had a few issues - My ute tub has ridges so trying to fix the slide was difficult as the holes didn't line up with the high or low...

I just picked up my fridge slide, opened the box and have no bolts (or manual, which I knew I wouldn't get), but how do I install this in my patrol, I really don't want to drill new holes in the back.. any clues?