Not much on that front... I've contacted Choate, Ithaca, and Marstar on that, but these things are hard to find. Your best bet would be Choate, as they do make side-folding stocks, and I think they've got "standard" pistol grip stocks as well, but they don't ship this side of the border. They do, however, deal with Brownells, who (I believe) does ship up here. I was going to contact them myself, but don't have the money for something like that at the moment. If you do end up contacting Brownells on that possibility, let us know what comes out of it.
Your only other option would be to try to get a stock from a Norc M37 clone... Not sure if a distributor would sell you one directly, or if you have to buy the entire thing and just take the stock off. Should be a pretty good fit.
As for forestocks... nothing matching, but if you want black synthetic try Brownells again. They had some listed on their site. Apparently there's a guy out East who's a bit of an Ithaca guru... Ron Sharpe, I believe. His name seems to come up regularly in Ithaca parts discussions...
There's a couple other threads on here that deal with this same question (I can think of one off the top of my head), so take a look through some posts and maybe something will work for you.