Elite Firearms has the springs and baseplates. The only place I could find GI followers was Springfield Armory.
Don't bother with Sarco, their rebuild kits are junk, the springs and baseplates are completely pitted and rusted. I called their customer service and she didn't beleive me. I had her go and check and she came back astonished that they actually sell the stuff. I'm talking thick pitting rust.