Yes, I got the same brackets in my kit yesterday. They work with an oversized M4 washer but it isn't ideal. My first showstopper was the very next step where you mount the smooth rod blocks to the M5 T nuts using the M5x8 bolts. The blocks I got are 6mm thick at the base, there's roughly a 1mm gap below the base to the top of the T nut even when you hold the dang thing upside down. So doing theby tmiller74 - Prusa i3 and variants