Adding Second Harddrive in place of Optical Drive?

Hi all,
just wondering does the lenovo website offer their own hard drive caddy and hard drive for purchase so we can add a second hard drive in place of the optical drive?? That customization potential is avaliable for the thinkpad t510 correct?

http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-73170
On the Physical Specifications part of that page, there is something which I do not quite understand: 
ThinkPad Serial ATA Hard Drive Bay Adapter III (43N3412)
Approximate height: 10.5 mm (0.4 in)
Approximate width: 128 mm (5.2 in)
Approximate depth: 133 mm (5.2 in)
Approximate weight: 0.1 kg (0.2 lb)
ThinkPad Serial ATA Hard Drive Bay Adapter III (43N3412) packaged in a shipping carton:
Approximate height: 40 mm (1.6 in)
Approximate width: 220 mm (8.7 in)
Approximate depth: 195 mm (7.7 in)
Approximate weight: 0.3 kg (0.7 lb)
what does the second bullet point mean? I am assuming that the first bullet point means that is the physical dimension for the actual hard drive caddy....so what does the second bullet point mean???????
thanks in advance

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