I need to replace the gum cover

Hello, after many years of good and loyal service, the rubber protection of the mouse shows large traces of use as well as a hole on the thumb part Do you have an idea to replace what I call 'the gum cover'? Thank you a lot in advance :)

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

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 1
crwdns2934285:0crwdne2934285:0