OK this is from memory, but:
1. goes in between the pad and number 2.
2. goes in between number 1 and the pistons pushing on the pad. ( ie install #2, #1, then pad on one side)
3. is tha clip that #6 goes through. It clips to the end of the pad to hold 1, 2 and the pad together. Sort of hard to explain without seeing a workshop manual. Search here for it, or ill dig one up.
4. is the copper grease. Put a schmear between each shim, and the back of the pad.
People say u dont need em, but ive never had pad sqeal (with rb74's) and ive never chamfered the edge of the pads.