Canon Paper Craft Special Vehicle 01 Series Assembly Instructions Manual page 4

Wheel Loader
Assemble in the same way as part 31.
Assembly Instructions
Referring to the cross section,
insert this part through the holes and
fix it in position at top and bottom.
Glue flaps a and b in order.
Insert into the opening
in part F.
Cross section
Overhead view
This is the joint between
the front and rear sections.