So as far as going with OEM spec for the rears... the offering by KYB does need to be collected and assorted.
I bought two rear Gas struts Part # 344-612 KYB, the KYB SM5382 Mount Kit containing the washer/bearing/rubber.
I settled on MOOG springs as a good OEM level replacement (some have said they are a bit stiffer than OEM).
..and I went to my local Toyota for the insulator, Top mount bracket, and strut bumper. I did pick up the KYB Strut Boot kit (SB108 I believe), although reviews said the universal fit is mediocre. I'll see how that turns out.