Yes that is the correct caddy for the Precision T1700.  Though when searching ebay, if you search using the part number "DN8MY" you will find them for less than $6 after shipping.
Hello I need to add third HDD on my 2 Dell Precision T1700, and I need two brackets. I have found this product on e-bay, but I am not sure if this is the right product. So if any member of this community, has ordered HDD Caddy (bracket) for Dell Precision T1700 and that  Caddy (bracket) did the job, please send me the link, so I can be sure that I am buying right product.  I have found some links in the older posts, but links does not work, show 404 errors or no website errors. Thanks in advance.  
Where to buy 3.5'' HDD Caddy (bracket) for Dell T1700