Yes, 1% will work fine.
Still, it's just as easy, if not easier to install a standard axial 1/8W resistor in there.
You can bend the wires into an L shape to then bridge solder them on to the two terminals side by side.
They are wired in parallel as there is supposed to be a capacitor next to each resistor per the schematic.
I verified this with my DVM by the way. So that gives you two solder points per connection to fudge the resistor in place.
Much easier than working with nearly microscopic size resistor chips IMO.
Plus you can buy them at Radio Shack. 1/4W will work fine too.
Just keep the resistor inside the edge of the pcb so the fins won't touch it when re-assembled.
Piece of cake!
Wolfey2014

Pea Ess, remember, mods' are done at your own risk!