Hub prices

[Duck89]

Hi- I recently got my attex and have begun to fix it up and look for parts for it. It came with turf tires on it with 'custom made' hubs welded to the wheel inside of these tires. I am new to the world of 6x6's and am not sure on a lot of things, one being where to find parts and their costs. I would either like to go with the original 3 bolt-hubs for the ballon tires or upgrade to the 5 bolt hubs for the newer wheel/tires. I have a few decent ballon tires and think I can get a few more for a complete set. I see richards relics has both of these, but I have yet to call on prices. Depending on cost/availability, what is my better option in this situation?

Martin