Verify your flange dimensions with the image below. This can be done without removing anything simply by measuring the flange at the back side of the drum.
61-87 Chevrolet C10,K10 Pickup
61-87 GMC 1000,C15,K15,K1500 Pickup
61-91 Chevrolet Blazer, Suburban, Vans
61-91 GMC Jimmy, Suburban, Vans
Even if it is listed above, if it does not have the correct flange measurements and lug count then the kit will not fit.
*This Brake Kit will fit inside many *but not all* 15 inch wheels. Please refer to the wheel clearance diagram to check to see if it will fit your specific wheel. Wheel Clearance Diagram