The Ox does require a different spindle mounting kit compared to machines like the Lead or WorkBee. We have a spindle mounting kit specific to the Ox or any machine with a Z actuator based on the 2060 profile called the Spindle Mounting Hardware Pack (2060) which you can find here:
https://www.makerstore.com.au/product/pack-spin-mnt-2060/
We have a tutorial on how to assemble this kit on our wiki linked below:
http://makerhardware.net/...g_hardware_pack_2060
Please let us know if you have any further questions.
Kind regards
Tawanda
Maker Store Team