Ed,
If your on the Mercury "Backorder list for that part" ( Merc part number 1159-847523A2 ) it's been put off even farther. If your housing is OK and not cracked I have the tooling ( I made it ) to press the old bearing out and new bearing in and I have several new bearings... If this is something you need or can get you out of a bind call me...
Jay @ JSRE 1 281 576 5088 cst