http://www.bobsmachine.com/Products/...parts_Tilt.cfm
These are stainless and you'll never have the problem again. Just make sure you have the engine supported when you change it out. Either lifting eye and engine hoist or put a block of wood under the engine skeg and tilt the engine all the way down. Use your trailer tongue jack to make room so the engine is straight up and down.
Here's a few on of the stainless and non stainless variety on ebay.
http://www.ebay.com/itm/Mercury-V6-O...-/110954190843
http://www.ebay.com/itm/Mercury-Stai...-/261108440530
http://www.ebay.com/itm/1997-MERCURY...-/390423363583