HP Pavilion 15t - Disassembly Tips (disk drive)

I've put the dimensions in for HP part "DVD/CD REWRITABLE DRIVE", model DU-8A6SH, part number 700577-HC2

My intent is to replace it with a hard drive "caddy", such as these links from amazon:

http://www.amazon.com/Drive-Unibody-MacBook-SuperDrive-Replacement/dp/B0058AH2US/

http://www.amazon.com/Adapter-Special-Designed-macbook-SuperDrive/dp/B0057V95M6/

http://www.amazon.com/WoneNice-caddy-9-5mm-Universal-DVD-ROM/dp/B004Y8SGXW/

Figure 1: Measurements of original drive

If anyone knows how to keep the drive secure in the chassis, that would be great. Is the tab in Figure 1 "top" something standard?