Just my personal opinion (and I've never torn my forks apart) given it is a rubber part subjected to likely significant force in sealing, I'd replace the ring just to be safe. Not like it's a bizillion dollar part...
grab all the kicks you can baby, you only make this scene once!
current rides: '09 GL1800AD "SENSHI"; 2003 RVT1000r (RC51) track bike... certified m/c addict. IDMWT #12. GWRRA #028890