Blowsion tubbies 2 install spot

I just picked up some blowsion tubbies II for my fx1 and was wondering where they normally get mounted (measurements). I called blowsion and they didn't have any measurements and haven't gotten any emails from them of pictures that I asked for. Any help would be appreciated.
 
;) Ok , you line up the front of the tubbie 4 1/4 , inches from the rear edge of the purple front bumper , shove it up tight against the bottom of the bond line , mark it out , drill out the bolt holes , repeat for the other side and that's it....
 
They did tell me over the phone that they go flush with the bottom for part of the tubbie. They also are the screw on type.
 
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