They are 5MM bolts. Very cheap at the hardware store. Also buy a 5MM tap. When you pull the plate off by tightening the bolts (after removing the center nut), the threads on the bolt will be damaged. When you unscrew the bolt from the holes, the damaged screw threads will damage the threads in the holes in the plate. Run the 5MM tap down those holes to clean them up so that you can get the plate off the next time. (Which may be in 5 minutes, if you took out too big a shim and now the gap is too small.)
You have to unbolt the compressor from the block to have room to do this.
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