Here you go, Phil. This is 1/4" graph paper, three pages. Print out in colour so you can see the blue lines, cut at vertical demarcation, tape pages together.
XK120 bumper support member C3831 .pdf (996.7 KB)
You do know that you have to put this thing into the front of the body before reuniting the body with the frame. It may be possible to get it in once the body’s on the frame but it would be a bear of a job if so.