Oil seal/Dust seal 
 
Genuine seal which is designed to protect the essential parts on your machine form any contaminaiton from dirt. 
This seal fits in several different areas on your machine, can be used on the bucket end of your digger arm, use on the rod end of the bucket cylinder. This is used on many machines and for many different areas. 
 
Not sure if this fits your machine? Please get in touch with your serial number and we will be more than happy to check this.