Based on the web search results provided, it looks like finding replacement gears for your Craftsman P/Molder Model # 351233831 might be a bit challenging. Here are some options to consider:
Check Sears PartsDirect: Sears PartsDirect has a page for the Craftsman 351233831 planer, which may include information about replacement gears [1]. You could try searching for the part numbers there or contacting Sears PartsDirect customer service to see if they can help you locate the gears.
Check eReplacementParts.com: eReplacementParts.com is another online retailer that specializes in replacement parts for power tools and other equipment. They have a page for the Craftsman 351233831 planer that includes a list of replacement parts [2]. You could try searching for the part numbers there or contacting eReplacementParts.com customer service for assistance.
Check forums and classifieds: It's possible that other woodworkers or Craftsman enthusiasts may have spare gears or know of a source for replacement gears. You could try posting a message on a woodworking forum like LumberJocks [4] to see if anyone has the gears you need. You could also check classifieds sites like eBay or Craigslist to see if anyone is selling the gears.
Consider repairing the gears: Depending on the extent of the damage to the gears, it may be possible to repair them rather than replace them. You could try taking the gears to a local machine shop or gear repair specialist to see if they can help.
References: [1] "Official Craftsman 351233831 planer parts" on Sears PartsDirect:
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[2] "Craftsman 351233831 12-1/2In. Planer - Molder Parts" on eReplacementParts.com:
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[3] "How to sharpen Craftsman planer blades" on Sears PartsDirect:
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[4] "Looking for replacement gear(s)" thread on LumberJocks:
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