According to this link the rear camera module seems to be for both the HTC Desire 700 and the 709D.
If you can access your rear camera you may be able to check if the part number printed on the flex cable of the rear camera matches the part number shown on the flex cable in the picture (click on alternate view of part - below main picture to see reverse side of part ).
If it is the correct part then you could also search online using the part number 54H00507-00M to find other suppliers that may suit you better.
You could also contact the supplier in the link to verify that it is compatible with the 709D. Just scroll to the bottom of the page to the section Customer service and contact to find the details
Hopefully this is of some help.