Manual mechanism old style.
4 3/8" dia large Bell
Mount hole measurement is 5 1/2" wide X 6 1/4" long.
Also available 5 1/2" wide X 5 1/2" long.
Mounting holes are slotted to provide 3/8" in or out adjustment
The 1" threaded Post is 8" in length
Large Tilt range is 3 1/2° to 19°
Manual mechanism with larger older style bell. Mounting plate measurement for bolts is 5 1/2" wide x 6 1/4" long