Were you able to measure the cups? On the Tange site the DX4 headsets state a outer diameter of 34mm but you should double check it. Tange makes a Technoglide in a similar size but it's pricey. You will have to google "Standard" 1 1/8th thread less headset. Other brands I can think of is FSA MX 1 1/8th but I'm sure there is others. Also check if your forks need a star nut and make sure that's included if you do. You might need to also order some spacers as the headset height might be different.