Picked up a Principia Rex road frame I’m going to build up but need a headset (normal push in cup type not integrated). The top part is 1 1/8″ so easy to find something but the bottom cup is 1 1/4″, which is proving hard to find. I can only find Chris King ones searching which are £95, more than the whole thing is worth probably. Anyone know where else you can get 1 1/4″ headset (bottom bits) from? I think some older mtb’s used them?