This is a DU-BRO .80-.91 4-cycle Vibration Reducing Motor Mount.

FEATURES: Made of aluminum
Two piece design allows for many different engine sizes to be mounted
Effectively reduces vibration/harmonics, greatly reducing airframe &
component fatigue
Simple & easy to install
Specially designed elastomerics(rubber mounting grommets) to absorb
vibration
Helps in airframe noise reduction

INCLUDES: One left half of mount Eight elastomerics
One right half of mount Four mounting screws
Eight spools Four blind nuts

SPECS: Length of each arm: 3-1/4"
Overall length of mount: 4"