I am using these o-rings with my copper platter Momentus TTW turntable. They are very close to the clear ones that were an option with the rim drive set up. I have had a lot of success with them. They are very quiet and last a long time. I see people are using 1/16" wide o-rings. Too thin, they will transfer noise to the platter. These are 1/8" wide which is what you want to use.
206 Polyurethane O-Ring, 70A Durometer, Round, Translucent, 1/2" ID, 3/4" OD, 1/8" Width (Pack of 5) https://www.amazon.com/dp/B0053V30TY/ref=cm_sw_r_cp_apa_i_JtHmCbVXB59NK
206 Polyurethane O-Ring, 70A Durometer, Round, Translucent, 1/2" ID, 3/4" OD, 1/8" Width (Pack of 5) https://www.amazon.com/dp/B0053V30TY/ref=cm_sw_r_cp_apa_i_JtHmCbVXB59NK