I lost bass ring and red and/or white spacer rings on only the left one of my pair. Spent a few weeks without realizing that spare rings came in the original product box but by now the signature with this non-matching pair has become the best ring combination I ever tried on DN-2000J - very good transparency, mids, highs and lovely bass. I am not even considering opening the box to replace the lost rings on the left side.
So on one side you have the spacers and the other side there is nothing? I really like the spacers as it makes the boss a bit longer so that I dont have to shove them so far into my ears. I bought some Westone tips and they seem like they are longer then standard tips.