Ah, photo isn't loading up. It's right down by the axle, there are two straight casting lines which run down from the chainring bolt holes, then a irregular semi-circle between them. I'll try and get photobucket to play ball, file size may be too large.
Don't bother, use the built-in LFGSS attachment system. If you can see the picture in your fork post, it's only because it's in your browser cache. The rest of us are seeing photobucket begging you for money.
At the end of the arm?