Horizontal spacing - 1 1/8"
Vertical spacing - 5 1/4" (top hole is offset to the inside)
Arm - 2 5/16" #76 (stamped on arm)
Arm Hole - 3/8"
Stamped inside housing is a large 93 and
PAT NO D-198202 US
12 RD 1963 CAN
R H
Not sure if this helps or you just chuckle every time someone provides that info but better safe than sorry.
MUST BE WHITE!
Thank you
