NOTE: If installing the box on top of a stake bed, disregard these instructions. Mount the box with the bottom fully
supported or structural damage will occur to the box.
NOTE: When installing in a pickup bed the box must be installed per these instructions using the mounting legs supplied.
This box must never be bolted to a ladder rack or structural damage will occur to the box.
NOTE: To prevent rust from occurring, touch-up any drilled holes.
STEP 1. Park the vehicle as level as possible.
STEP 2. Turn the box over, and at each end of the box, mark a 6" long line 7/8" in from and parallel to the end. Start the line at
the front of the bottom (see Figure 1). For Models 272-3-02/290-3-02/291-3-02/296-3-02/297-3-02/ 372-X-02/390-X-02/391-X-
02/396-X-02, mark a 6" long line centered side to side on the box, 12" apart (see Figure 1.).
STEP 3. Place the Mounting Pads in position on top of the truck bed (as shown in Figure 2.). Tape the Mounting Pads to the truck
bed in a few places to keep them from moving or falling off when installing the box.
5/16-18 x 1-1/4"
Hex Head Bolt
Figure 2. Main Assembly View
INSTALLATION INSTRUCTIONS
6" long line-
7/8" in from
end of box
3/8" Holes -
typical unless
stake beds interfere -
see instruction text
6" long lines-
centered
side to side
12" apart-
only for Models
272-3-02/290-3-02
291-3-02/296-3-02
297-3-02/372-X-02
390-X-02/391-X-02/396-X-02
6" long line-
7/8" in from
end of box
Figure 1. Box Marking
3"
Max.
5/16 Lock
Washer
5/16 Flat
Washer
Blind
Fastener
Line marked
even with
bed lip
Front
of Box
Mark this line
even with bed lip-
only for Models
272-3-02/290-3-02
291-3-02/296-3-02
297-3-02/372-X-02
390-X-02/391-X-02
396-X-02
Line marked
even with
bed lip
1/2"
7/8"
5/16 Flat
Washer
3/8" Holes
5/16-18 Nylon
Lock Nut
1/2" Hole
3
5/16-18 Nylon
Lock Nut
Fender
Washer
Plastic
Retaining
Washer
5/16-18 x 1"
Hex Head Bolt
5/16 Flat
Washer
Mounting
Pad
"J" Bolt
Leg
See
NOTE 1