model name / number:Small-111 Large Universal D ball
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Smaller one
double-socket arm mount, 2.5"-dia. round base, 1.5" rubber ball, and flat, 6.25"L x2"W rectangular plate.
I had a 7 in Lowrance on this mount.
Larger one
The base features a 2.25"-dia. D-size ball, short arm, and 6.25"L x 2"W electronics plate with D-size ball to support your fish finder gimbal bracket.
I had a 10 in Helix on this mount.