This set includes:
The Borg reducer (7880) has to be connected after the rotator. In the picture below you can see how to connect the Borg 55FL lens. PLUS 80mm support rings are not included with this kit.
If you own the Borg 55FL f3.6 with another focuser and you want to replace it with the ESATTO 2", you have to order this entire kit since, in order to use ESATTO 2", the tube length and adapters are different.