Hi.
I have 2 of these, one is still in its box, unused and with no connector. The image attached is the one that I am using.
These are much more beefier that the motor supplied with a Robofocus unit and you would merely need to solder a DB9 plug to it to make it compatible with a Robofocus type controller (Pegasus Astro UPB V2 for example).
Here is the spec:
https://www.hurst-motors.com/lsg42geared.html
scroll down to the chart, its the first entry.
I dont have a bracket so you will have to custom make that to suit your particular focuser.
These are $113USD ($154AUD), for sale at $110 plus shipping.
cheers
Martin