cant get my FAST copy to work

does the extension piece screw into the block replacing the item with the slot in it pictured in the first pic with the blue block, or is it two pieces i.e. into the block, then another to extend thru the oil cooler and provide the thread into the filter?
can someone sell me the bits i need from a scrapped Mk1 engine? dont need the oil cooler, just the extension bits please?
Craig