**try mouser.com the minimun order for a 74HC595 is 1

i imagine you want the 74HC595 even if the picture says 74HC575


74HC595: 8-bit serial-in, serial or parallel-out shift register with output latches; 3-state


**how are you planning to emulate a 74HC595 using a 74HC595(u2) in the circuit you posted?

i think your circuit is not the equivalent of a 74HC595 it's logic diagram is in page 6 of :

http://www.semiconductors.philips.com/acrobat/d...T595_4.pdf