NEEDED/ Mercruiser exhaust manifold

HELP, needing a mercruiser 898 port side exhaust manifold.End riser type. Need it for a small block chevy, 305 motor. Noticed a small amount of water in boat this weekend and found a small crack in my port side exhaust manifold, tried JB weld and when it gets hot, opens up a touch. Just don't want to split when on a long run. Anyone with a manifold for sale, please let me know with price and location. Need asap. Thanks all, Mike

Still lookin. Thanks for the inout so far. All have led to a dead end, all center riser styles. Need early 80's style or late 70's. Thanks again, Mike

Found a used manifold @ Laird Marine, Port Clinton. Thanks again everyone, Mike