You can't get new L67 rods through GM anymore, they superceeded the numbers to the L32 rods. If you can, find a used one or maybe O'Reilly's can get you an L67. Just make sure that they are the forged style, and not the powdered metal one. You can tell this by looking at the big end. On the L32 rods, you won't be able to see the seam, the L67 are cut and machined. Stick with the L67 and you shouldn't have any problems.