http://www.e-gunparts.com/productschem.asp?chrMasterModel=082Zz50%2022LR%20SEMI-AUTO%20RIFLE
Try Numrich gun parts corp.They may be found on the web.I would also try gunbroker.com or E-bay if you have no luck with the first site mentioned.
Try e-gunparts.com
I would seriously start my search at numrich gun parts corp.your gun is a model 60 glenfield that was made for montgomery wards by marlin/glenfield.
50-1000 depending on specifics
1997-1999 for the Model 50 DL.
Sure.
50-90 dollars depending on overall condition of your Marlin model 783.
The Marlin model 50 semi-auto 22cal.promotional rifle,which was made from 1931-1935,ranges in price from 85-150 dollars today.
I've bought them for $50-$75 in the past.
50-100 USD
50-135 USD
50-300 USD, 12 gauge pump