WR Front Wheel Help

[Will87]

Ok guys really in need of some help here, my WR400 has had a fairly long list of bits wrong with it, but i have managed to rectify the majourity of these but when it came to time to sort out the excess play in the front wheel bearings but after taking the front wheel off i have come unstuck. . . As you can see in the following pictures the bearing housing (also doubling up as the speedo drive from the front wheel) has cracked while also missing the retaining circlip, can anyone tell me what said part is called or any ideas as to what i can do?

https://img413.imageshack.us/img413/4905/hub1hf9.jpg

https://img211.imageshack.us/img211/4468/hub2iu2.jpg

Cheers,
Will