I need to buy a headset for an On One Whippet. Apologies for my crappness but how do I tell which headsets will work? Thereis one on the On One website that specifically says for the Whippet but I want to have a search on CRC to see what is on offer. The two things I have gleened from the On One description is that it needs to be integrated and its 1 1/8. Is there anything else that distinguishes the headset for this frame apart from others?