They are a bit of a Jigsaw but not that hard,
might have a fitting instruction sheet in the
parts cupboard... If so will copy and email
to you. Let you know soon if its there .

Sorry hmmm no sheet in my box either,
they only fit together one way anyway,
sorting out the shim/washers for the breathers
took a few goes the first time.....
Good Luck.

Send a PM to Walka and ask him for the instructions. He sold it to you so they must have the things