Are these the tips you're talking about? www.ebay.com/itm/BlackMedium-Size-x-6pcs-replacement-Triple-Style-tips-earbud-for-BRAINWAVZ-B2-/291143026546?pt=LH_DefaultDomain_0&hash=item43c97a0772
Looks quite similar. I use this one:
http://www.head-fi.org/t/744083/dunu-titan-1-titanium-coated-diaphragm-half-in-ear-earphones/285#post_11282689