Your best bet would be to keep an eye out on Ebay. Any stock for a winchester 1200, 1300 or 1400 for a 12, 16, or 20 gauge will fit that gun. You could get an inexpensive hardwood stock on ebay for a winchester 1300 Ranger, cut the stock to size. You can also find extra barrels for a 1400 on ebay, although they're not as common as stocks.
I am also told a 1300 barrel will work if you have the skill and ability to drill a gas port through the barrel in the right place. Supposedly the 1300 and 1400 barrels are identical except for the gas port, but again, I don't know this for fact.