Screws Problem?

Alrite, this might be really weird problem for all you guyz. I have an Inspiron 1505 laptop. Recently after having the laptop for 1.5 yrs, my hard drive started to die.("PrefDisk Notification"). So, i bought a new hard drive and i downloaded dell's manual in order to change my hard drive. I went through the manual, and it told me to take off two screws from the back of my laptop so that the hard drive gets loose and i can take it off. And for my surprise when i looked back, there weren't any screws. I got panicked and i thought since there weren't any screws, my old hard drive might have got loose and it started having problems.

 I don't have any insurance, so i can't ask DELL for the screws now. And, nope i never touched any screws of my laptop in my life (Acutally i just discovered the location of hard drive and..huh..those hard drive's were so small..). So, do any of you guys know..where can find those screws? I have attached the picture of the screws here...so you guys can look over it.