Effective March 1, 2006, Webb Wheel's 66864 rear 16 ½ × 7 brake drum will have a different look. The company has added external rest pads and removed valve stem slots from this industry-standard brake drum. Webb customers are advised that all application specifications remain identical between the 66864 drums shipped before March 1, 2006, and product shipped after that date with the new appearance. The Webb logo and part number will be plainly visible on the new product.