front hub assembly

I've got a pair of hub caps for sale. Missing a few bolts and snap rings. Thoes are that's $3-$5 @ any dealership. Selling them for $200 comes with Hines owner's manual.

I don't understand why I can't find a simple needle bearing without having to buy a whole front knuckle assembly for almost $300! does anyone know where a suitable bearing might be found?(I've checked all the auto parts houses)