I have a double helm in my Crownline with a single bolster across the whole seat. The only time the bolster is down is when we are docked.
As for the split bolster, just seems like another set of crevices to collect dirt and Frito crumbs
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1998 Crownline 268CR 7.4L B2
"La Vida Loca"
1999 Yamaha SUV1200 Waverunner