[This comment was added later - the holes in the photos might not be for the Unison (Ride-Control) seat holes - The Factory Assembly Manual has good illustrations. Read information in later posts.]
The holes in photos 35-36 are for the Unison (Ride-Control) set-up.
I cannot see enough of photo 37 to figure that one out.
Photo 24 is another place the Unison (Ride-Control) seat set-up attaches to (I think) - 2 bolt holes for one of the rear-cab wall-brackets (I think).
[This comment was added later - the next sentence is incorrect. Read information in later posts]
Nothing has to be drilled in the 54/55 cab in order to install the various parts of the Unison (Ride-Control) seat assembly.
Last edited by tclederman; 01/05/2012 4:27 PM. Reason: ignore this post and look at later posts - sorry, Tim
