My greeblies for the chestbox on a TIE Pilot. There are parts for both ANH and ROTJ pilots.
Rockers
The rockers and Cog have a 3.5mm hole intended to be tapped for an M4 screw for solid attachment to the chest box. If you drill all 3 holes in the chest box for each rocker you will be able to swap the ANH and ROTJ parts to use same chest box for both variants.
Cog
The cog is 50mm diameter. This seems to be accurate but for my personal box this seems a little bit large so you may need to scale them slightly to get the correct look.
Code Disc
The code disc is based on reference photos and measurements from the correct found part. These were then cleaned up slightly. There's 2 versions an accurate one with the hole all the way through and one with the hole partially filled.
The author marked this model as their own original creation. Imported from Thingiverse.