Bases are a breeze if you aren't concerned what brand. Neary any store that carries them including Gander Mountain will have them, frequently in several different kinds. I have a Weaver mount on my 30 AW (same as 336) that I bought in a discount bin with rings for under $10.00 a lot of years ago. It's ugly but really works so I haven't messed with it. Some day I will put some Leupold hardware on it if I have to remove the scope. but until then why mess with success.
For the other parts I am no help.
Have fun!