OK, I did a little searching for you and I came up with nada. It seems the 710 and 700 do have different stocks. I wasn't able to find an aftermarket stock for you. The 710 wasn't made for that long so that is probably a good reson for the lack of aftermarket parts too. I looked at gunbroker.com and nada - which is another indication that there are no aftermarket stocks too. Everyone seems to sell their old stock on line if they buy a new one. You can call remington, but it is a discontinued line and generally speaking I've found that brand name parts are spendy.
One site I have found for gun parts was Numrich Gun Parts Corp, We Buy Parts
I have never used it so...
IMHO, I'd jerry rig the stock w/ an apoxi or something to make it work and paint it if possible. Good luck, Mark.