1949 Marlin 336 parts and info.

[photog3740]

I have a just purchased 1949 Marlin 336 30-30.
The front sight has a gold bead, but needs to be replaced. Does anyone have one or any info on where to the sight?
I also need the forearm band and screw, as the one currently on the gun is dinged up because the screw has been messed up, and if anyone has a schematic and or parts list for the gun, that would be great.

Any help is appreciated.

Thanks!