AT-9 Mounting Plate Size?

[Revenoor]

Long story and not really relevant but I am being offered at good deal to go to the HR-20. I now have my dishes mounted on the 4X4s supporting a deck and am wondering what the foot print of the plate is, will it work on a single 4x4 or will I need to incorporate an addition surface to mount it on. Does anyone have the dimensions of the bolt pattern or perhaps a template? D's rep was not able to answer when the slim line dish would be available.

 

[lou_do]

Long story and not really relevant but I am being offered at good deal to go to the HR-20. I now have my dishes mounted on the 4X4s supporting a deck and am wondering what the foot print of the plate is, will it work on a single 4x4 or will I need to incorporate an addition surface to mount it on. Does anyone have the dimensions of the bolt pattern or perhaps a template? D's rep was not able to answer when the slim line dish would be available.

The distances between the mounting holes are:
Main mount - bottom
Horizonal: 4 1/2 inches
Vertical: 7 1/2 inches

Top mount
2 bolts centered about 2 inches apart.

Pictured here is my mount.

 

[Revenoor]

Thanks for the info. That bolt pattern will not fit the existing 4x4 so I think I'll mount a steel plate there with some countersunk screws and then drill and thread the bolt pattern you supplied for the bottom ( I assume that the main plate has slotted holes, are they all slotted horizontally or 2 horizontal and 2 vertical?). The support won't be an issue.