Also, those old surplus M-14 synthetic stocks are now in very short supply, usually sold out for the last two years on Fred's site. Of course many people have surplus wood stocks, and Freds has some nice ones, as does Treeline.
This is part of the reason why there are more synthetic and aluminum based stocks for the M-14 nowdays. If you have the cash, the poster formerly known as M14Doc at this site, now makes high quality carbon fibre stocks in several different configurations...telestocks, precision sniper stocks, a synthetic version of the E2 squad auto stock (has a pistol grip), and also a carbon fibre version of the standard M-14 synthetic stock.
Nowdays, I'd think your best bet would be to check all the various internet sites where people put parts up for private sale, like the EE, but also others. Or spend extra for one of the Doc's nice stocks!