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.
Which model??
Parts for the model 1892 are tough to come by, especially if they are mag tube parts. Some parts for model 1892's can be found at Wisners Gun Parts. They have an internet site at: http://www.wisnersinc.com/
The Sears Model 42DL .22 caliber rifle was manufactured by Marlin Firearms, their Model 80. Check with Marlin for parts availability.
It is the exact same rifle as the Glenfield Model 30A, and yes parts are the same as the Marlin 336. Forearm is the cap style.
The Marlin model 38 was a pump action .22cal rifle made from 1920-1930.If there are any parts available it would be at Numrich arms Corp.They can be found on the web.
The marlin model 39A is the rifle model,while the Marlin model 39M is the carbine model.
Go to Marlin's web site and ask for one.
this is a bolt action rifle
The marlin model 781 .22cal rifle was made from 1971-1988.
Try e-gunparts.com
We have virtually all the parts for most Marlin models. sales@countrygunsmith.net
I believe it was a Marlin model 49. I had one of these myself in the 60's. If you are trying to find replacement parts, then you can use the Marlin parts as is. That is what I did, parts for Marlin are easier to find and sometimes cheaper.