I have a complete FP20 carb that appears to have the exact same needle valve.

Phil

   I think that is also the same needle valve used in the FP series rear needle set up when that first came out. It's a good set up and they never should have changed it back to the "O" ring style like they did for the LA series. Tower Hobbies may still have some of those.
   Type at  you later,
   Dan McEntee

I may have something.  Do you just need the needle, or do you need the whole valve assembly?

   The ones used on the FP-rear needle vale series, both R/C and C/L versions, used that needle. The needle valve assemble was mounted to a metal bracket held on with the rear cover plate screws. The NVA for the carbs you have screwed into the carb body, a 4mm fine thread I believe. I use these NVAs for spigot style venturls for control stunt applications. I think they are quite universal among a wide range of OS engines starting with the MAX series up to the FP series. That may help your search. You may have one in a junk box and not even know it! Looks like you have had a good response to your post so you should be fixed up.
   HAPPY HOLIDAYS!
  Dan McEntee