7f33ac1a_ecp_cc__Value_Notes
[Part] R2L, R2R [Size/#] 1/8W is okay [Value/Notes] 
These are the grid stoppers that help quell tube oscillations. They may or may not be necessary here. You can probably just jumper them, but if you use them, 100R to 470R is a good range. As high as 1K is fine if that's all you have. In an ideal world, you'd use a carbon film resistor or carbon comp here (AB, Riken) but metal film is fine too.
ecp.cc
Value/Notes