X-Tension Adapter Leather Washers
Tiger Cue X-Tension Adapter Leather Washer Only 
For 5/8(18) weight bolt system 
22mm od x 15 mm id 

And

Tiger Cue X-Tension Adapter Leather Washer Only 
For 3/8(16) weight bolt system 
22mm od x 9 mm id
SKU TCX-W & TCX-W1