We’ve measured the Ace 03 up, and we get a real-world hanger measurement of 132mm, an axle of 199mm/7.83″, and a height to the center of the axle of about 49.5mm with the stock bushings, with a weight (including all supplied nuts and washers) of 340g per truck.
The bottom bushing measures 11mm, and the top one is 9mm. The provided bushings measure 85a on our durometer, and should be fine for most skaters out of the box. Note that because these are low profile trucks, many standard aftermarket bushings won’t fit; you’ll need to make sure you get a set designed for low trucks, or you’ll throw the turning geometry off. Try to at least match the height of the bottom bushing (11mm).
Finally, the pre-installed kingpins are of the modern splined variety, and like most modern trucks, the baseplate has just been hollowed out enough to prevent you fitting an old-style hex head or inverted kingpin.