There is a part supplier list on the Remington Society of America, check that page one of the best is e-gunparts.com but there's a lot more listed on that page.
usually the stock is behind and the forearm is in front of the receiver.
Check this list on the Remington Society of America: http://remingtonsociety.com/rsa/service
The stock for this model gun can be found at cabella's
You will not likely find a Remington stock. I put my 722 in a Bell and Carlson stock and I love it.
Check on ebay. You will find plenty of synthetic options and occasionly some wood sets. Most 7400 forearms and stocks will fit 742 models.
Try on www.GunBroker.com They list stocks for the Savage Model 99. I have bought several from this sight for my Model 99 Collection.
The Remington Model 740 semi-automatic rifle has long been out-of-production. You may be able to find an original stock on one of the firearms auction sites, like Auction Arms.com, or you might try ebay. Consider that the later model rifle stocks, like the 742, 7400 and 74 Express stocks will also fit, but will not match the 740 Model forearm pattern.
Contact Remington directly.They should be able to identify the variant of model 700 rifle you have after a brief description of your rifles stock,finish,barrel length etc.
Check the list of vendors on the Remington Society of America here: http://remingtonsociety.com/rsa/service
The sportsman 78 model Remington is the same as a Remington 700 adl, but i have yet to find whether to buy a short or long action stock for mine... so i would just go for a rem 700 adl stock
Did you ever get an answer on this question? I also would like to get a synthetic forend stock for my 1100 sf. Cant find them anywhere, if you found any could you forward the info to me at tntmontana@bresnan.net thanks Tim
Check the receiver, barrel, under the forearm