I'm looking for the part that holds the blade to the mower.

The block that holds the blade to my E2104011 mower is cracked in half. I'm wondering what the part number is or where I might find one. THX!

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0