Litoexpe 12 Pcs 3D Printer Silicone Solid Bed Mounts, 3D Printer Heat Bed Leveling Parts, 3D Printer Leveling Spring Replacement Part Black (9 Pcs 18mm+ 3 PCS 16mm)

Here is what I installed: https://www.amazon.com/dp/B0DMFDLGDD?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_3 Most of these are 16mm diameter and 16 mm or 18mm tall with a 4mm hole for the screw in the middle. Just get a few more of the same height and diameter that you already have. Make sure that the spacer sits on the bed carriage (under the heated bed) properly. If you have the older "tray like" bed carriage, they will fit as is. If you have a frame (the newer style) use a metal washer between the carriage frame and the spacer. If you need more hints for the EN4Max, just ask. I have been running this printer for almost 3 years. Good luck.