I am not familiar with that model but on mine, there are brackets and screws. The bottom edge of the bolster has mesh and grommets. Into a few of those grommets a screw was driven. You need to feel around for it, it's tough to get the screw driver into the screw head. On mine there were only two screws. After the screws are removed, the bolsters slides up and out. There are metal hooks on the gunwale that fit into holes on the back of the bolster.
