This listing is for a pair of GLM Marine 4-inch Elbow/Risers compatible replacements for 1987-2002 4.3L V6, 305 5.0L 350 5.7L V8, 454 7.4L 502 8.2L V8 ALL with Wet joint applications and 4 inch exhaust tubes. Replaces Mercruiser OEM # 807988A2, 807988A03 & 807988C