If you need the tall rings for the scope to clear the barrel or the hammer then you have a couple of options beside replacing the stock. There are lace on cheek pads and some that glue/screw on that come in different heights to get good alignment. I have used both, and prefer the glue/screw on ones. I can't recall the brand, but I got mine at Gander Mountain, so they should be available at most gun stores and mail order as well.
Good luck!