Also, unless the rims themselves are junk/damaged/corroded, it's usually easiest to just take them to a tire store and get new tires put on them. I would not assume there's enough standardization between different manufacturer hub designs to want to even mess with trying to install new hubs on the existing spindles, at that point might as well replace the axles and then buy spare hubs for the new axles from the same axle manufacturer.

If the rims are corroded but otherwise serviceable, I would just take them to a tire store and have the tires removed, take them home and refurbish them, then take them back to get new tires installed, overall that's probably going to be the cheapest way to four new tires.