Looking for special size 2.5mm & 3.5mm male plugs for AQ and Meze 'phones

A while ago I heard of a company that sells the 2.5mm and 3.5mm male plugs with a smaller diameter barrel that allows fitment into the cups of the AQ Nighthawk and Meze 99 'phones. Both AQ and Meze do not sell just the male plugs and I've checked Moon Audio, Headphone Amp, etc. and they do not have them.

Any help would be appreciated.