This Westernfield is the same gun as a mossberg model 353. this may help find parts easier.
Try e-gunparts.com
The Wards Westernfield Model 62 .22 single shot rifle is a Stevens Model 83. Parts can be located @ Numrich Arms Corp. (egunparts.com)
Mossberg
I would start my search at Numrich gun parts corp.They can be found on the web.The westernfield model 808m was made by stevens firearm company.The stevens model 87 is the same gun as your western field 808m.
Havlin Sales. They are available on their website. They carry many parts for older Mossberg rifles and shotguns. About $5.00 for the plastic peg, plus shipping.
Want ads, gun shows, e-gunparts.com, gun shops.
50-100 or so
Gun shops, gun shows, garage sales, want ads, e-gunparts.com
You can expect the value of your firearm to be between 50-125 dollars depending on the overall condition of your westernfield.
where can i find replacement parts for a 22 caliber Stevens modle987
Stevens 416 is the same