The M48 sensor tilt plate is independently developed by ZWO and specially made to match telescope with M48 thread. The thickness is 5mm. It has several screw holes on the surface so that you can easily connect it to the M68 OAG and APS-C & full frame camera like ASI2600/ASI6200/ASI2400.
The best solution of 55mm back focus length:
The latest connection methods for the M48 sensor tilt plate can be found here:
The best solution of 55mm back focus length.