The Sportsman 58 is a gas operated
semi auto shotgun, and was Remington's first gas auto. The gas action was inside the magazine tube, hence the capacity is only 2 rounds in the magazine. It was the predecessor of both the 878 and the 1100. The 11-48/Sportsman 48 was Remington's streamlined long recoil action semi.
Keep watching eBay, and check here, they usually have some -
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You can probably repair and refinish your stock so it looks as good as new, or get someone to do that for you. World's cheaper than having a stock set made. The 58s are good shooting guns. If Remington hadn't come out with the 1100 when they did, I might be shooting a 58. Good luck.