3"spacer kit (with 9" bolts) for a 7 degree dry joint riser (MC-20-864309) sold in pairs. Mounted between exhaust manifold and exhaust riser.
Used with MerCruiser Dry Joint exhaust applications on 350 MAG, 357 MAG, 383 MAG STROKER, 4.3L, 5.0L, 5.7L, and 6.2L engines that use the 7° degree riser.
Manufactured by Barr Marine. Part number MC-20-864929A1.