Normally, I would recommend you buy any Azusa parts directly from Azusa, because of their speed in shipping and customer service, as well as their pricing. However in this case, OldMiniBikes sells the six inch kit for exactly the same price as Azusa does, has a proven track record of customer service, and quick shipping, AND provides this forum right here. I also have no skin in the game, and no need of butt snorkeling the owners, though I did hear that
@CarPlayLB will be manning the OldMiniBikes kiosk at Windburn this year featuring a ten-dollar till your lips bleed, kissing booth.
Speaking of which, if you run into any difficulties with a project you got from OldMiniBikes, their help line is experienced, and responsive.
https://www.OldMiniBikes.com/mini-bike-kit-with-6-wheels-az3541.html