Model 52 - Reel seat or Deckhand style.
Set the opening the mounting post to the widest and measure.
These are 1-3/8 center to center on the mounting post.
Old Penn wingnut clamps do not work with trigger clamps
Please loosen the 2 nuts so that bolts are loose and wiggly. Install the clamp over the studs, secure the barrel nuts to that they line up to the grooves in the clamp Secure the barrel nuts to snug fit. Tighten the loose nuts on the frame. Then snug up the barrel nuts. Check for alignment .
Fathom and Squall 25N, 30, 40N, 40.
Fathom 15LD2- 2 speed
Penn, GS 535 to 555
Penn 500, 113H
Tiburon 501 Frame
Note: please use factory Penn hardware.