Got my door lock installed today; Took a bit more work than I thought it would based on your excellent video and instructions. My door had wood just below the old lock, so that all had to come out.   But the lock fits and is installed and working. Now I can just push the door closed.
It’s an excellent product and fit. The video helped immensely. The only thing i did different was use a Dremel to cut through the fibreglass instead  of a jigsaw.
Thanks again  George