Thanks for all the replies. I heard back from Felt and they were able to point me in the right direction (FSA bearings). To address some of your questions, the headset is integrated, so no swapping it out. And I did actually start out at the LBS, which measured the existing bearings and ordered the Cane Creeks for me, saying they should work. Unfortunately, the ID of the top bearing cartridge was about 0.5 mm too small. Now I have to see if the LBS will let me return them. I'm hoping so. Thanks!