I assume yours a volvo sterndrives...Unfortunately these items are stolen very frequently, possibly due to the replacement price and ease of removal. It has been known for these to fall off during use therefore the demand for these are quite high. As a marine enginner these items are always removed as part of the winterization process, and I would recommend all owner's to do the same. I am sorry this dosn't help much if yours are already stolen but it may encourage somebody to remove the two securing screws and simply place them in a safe place during the winter months .