I HAVE BEEN SEARCHING FOR FOUR 15" 8 LUG CHEVY WHEELS FOR MY '88 GMC BLAZER. DOES ANYBODY KNOW WHERE TO FIND THEM?  

I am pretty sure that they don't exist, the wheel wouldnt fit around the brakes.   

They do make them but as the other guy said, most of them won't fit because the brakes are too large for the wheels to fit over them  

They do make 15" 8 lug rims. I have a pair. They work fine and don't hit or rub on the brakes. I only have them on the rear, if you have a Dana 60 front you will need to grind the caliper some. No big deal. Go to www.coloradok5.com/tech.shtml  They used 15" 8 lug rims on a 60 and show you how to grind them down. I got mine from 4WheelParts. It's there Xtreme Steel Wheels. Mine are Series 87 black powdercoat but they have chrome also. I also got them with 2 3/4" backspacing. The rear is the same width as the front now. Hope this helps.  

here is a web site i found that has 15" wheels for 8 lug chevy and gmc.http://forums.4wheeloffroad.com/70/624838/4x4-wheels/15-8-lug-chevy-wheels/index.html  

If you had used a GM 9.5 14 bolt SF rear axle you would not of had this problem as it can be had in 6 or 8 lug configurations. Most of the times 15 inch wheels will not fit on hubs designed for 16 inch because of clearance issue. I know that some grind calipers but this is best avoid when possible and with proper parts/axles it can be.