Carefully measured where the rear Miata hubs are positioned relative to the drivetrain so that axles can be ordered. It does little good to have the suspension just right if the arms hit the axles, the axles hit the chassis, or the CV boots rub on something, etc, etc. Since I have neither Honda nor Miata axle parts on-hand, it’s hard to know how much room to give them. I rather just order the real deal now instead of wasting money on used axles parts that won’t get used other than for mock-up. I refuse to weld a Honda and Miata axle together, so instead, a custom axle set will be assembled by a specialty axle shop.