The Western Field 808's were a Savage Mod 87. Check gunpartscorp.com
The model 228FR was made by kessler under model number 128.Most parts are interchangeable with the model 30C.
I can't find a cross reference to the Western Field mod 804. If you can identify the manufacturer of that rifle (because Western Auto did not manufacture any guns - they bought existing models from a variety of manufacturers and had the Western Field name placed on them instead of the actual manufacturer) then parts can be procured from several sources. I suggest that you consult a gun values book to determine who made the rifle. Mossberg, Savage, Marlin, Noble, Stevens, and Colt all sold different guns to Western Auto. Possible sources of replacement parts are: Numrich gunpartscorp.com Jack First jackfirstgun.com Bob's Gun Shop gun-parts.com Order the parts by the actual manufacturer and correct part number. Some of these sites have exploded diagrams to assist identifying the parts.
try: gun-parts.com
Numrich Gunparts.
I believe that is actually a Savage 520A, but if you can send a digital photo we can positively ID the manufacturer. I probably have the parts you need. sales@countrygunsmith.net
Your western field M72 was made for Montgomery Wards by Mossberg.It is the Mossberg model 472PRA.I would contact them directly for availability of parts.
The Western Field mod SD57 was manufactued by Stevens as their model 87. Limited parts are available from Gunpartscorp.com. Look around for other sources.
You can find a parts diagram for a Western Field 40N pump-action shotgun on websites that specialize in firearm parts, such as Numrich Gun Parts or Brownells. Additionally, you may check the manufacturer's website or forums dedicated to firearms for downloadable manuals or diagrams. Online auction sites like eBay may also have listings with diagrams included. If you have access to a local library or gun shop, they might have resources or books that include the parts diagram as well.
Your western field model 04M-489B was made by Mossberg.The Mossberg model 50 is the same firearm.These parts should be found at Numrich gun parts corp.They may be found on the web.
Numrich gun parts
Your best source for parts would be a local gunsmith. www.e-gunparts.com numrich gunparts
That rifle was manufactured by Savage/Stevens. We carry parts. gunshop@nctv.com