2000 Suburban shocks

I hope you guys can help me out. I have a 2000 Suburban 4WD with premium ride (RPOZW7) suspension without air ride. I am looking to replace my shocks as the have 99,000 miles on them. I have looked at the shocks and found part # 15756794 on the rear no part # on the front. I have looked up that number and found it not to exist anymore. I have gotten several different part numbers from different dealers and need to find the right ones. I have also found these shocks to be very expensive :banghead: Please help with any info that you have. Thanks again.