It's not a Nagoya rifle, like you named your pics, it's a Tokyo Juki Kogyo made rifle. It's one of the early ones that used formerly rejected stocks. Bubba always messes with the hard to find ones.
It would be nearly impossible to find a stock to match yours as they are unique to the early 27th series, so maybe about 5,000 made, who knows how many survive and if you get a stock it will probably come from one unmolested. Normally you could just splice in a front half under the barrel band and call it a day, but in these the cleaning rod hole, cleaning rod release button and the front band screw holes were filled in.