This has probably been covered numerous times already but still new to all this and trying to decipher all the info I see. Anyhow I'm swapping a 73 ironhead to a rigid frame it came with and the neck bearings were in rough shape and just wanna know if I can just buy timken bearings with the existing cups? I'd like to keep same front end so I don't see need to go to the 1" upgrade. Not sure what all involved if i do. Thanks