Surprisingly, I have noticed it being a Harley forum, Doc posted pictures of All Balls bearing kits, which I rate as pricey cheap shit, so thought I'd put a link to where good bearings can be had at good prices.
If a bearing that's specific to a particular function on any machine, it will have been made to the spec required by the customer, Harley in this case, by their chosen bearing manufacturer, so unless you know someone who has access to Harleys bearing maker, it'll have to be Harley who take your hard-earned cash, and probably plenty of it.
Run-of-the-mill bearings, 99% of them, can be had from any bearing supplier, Simply Bearings being one of many.