clone a hard disk

I have a 500 GB hard disk with used space is 50GB. when I want to use clone station to clone to a SSD 128GB. It cannot be done. because the disk size not the same. Is any brand clone station can do this or any other way can do. My system cannot use back up recovery fuction. The dell recovery always fail.  Computer brand Dell opticplex780. window 7 32 bit