Just spent some time under the front seats of my Vegas and found that the seats are held to the swivel mounts with 4 5/16" studs .
I took the nuts off ( 1/2" socket) and placed .300 spacers that I happened to have under the front two seat studs on each seat. The same could be accomplished by stacking washers.
It seems that .300 (a little more than 1/4") is all you can squeeze in there or else there won't be enough threads on the stud for the nut to grab.
That got rid of the bad angle on my seats and did not effect the swivel function at all .
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