The easiest way is to just check the return policy and test it yourself. You can get an idea from measuring the height of the drive bay. Also, if you remove the DVD drive it should have specs printed on it somewhere and give you a good idea of what size it is. Most of the time it's just one screw and pulling it out. Google for the service manual of your laptop and it should give disassembly instructions.
Also, make sure your laptop runs at SATA III (6.0GBps) on the connection to the dvd drive. Often times motherboards will only support Sata I (1.5 GBps) on the DVD drive. This means that if you have a SATA III ssd it will only run at about a quarter of the speed it should. HWinfo will do this for you. I recommend putting the HD into the caddy and having the SSD in the internal drive bay.