This is the 41.5mm long Spacer Block. It is compatible with the Small Roller (M601S0).
Mazak Reference: 46575100321
Additional Reference: AL62, MZ309-0321
Disclaimer
All products are fully compatible with referenced brands, but are not affiliated with, authorized, endorsed, or sponsored by any Original Equipment Manufacturer (OEM) or named brands, unless explicitly stated in the product description.