A lot of people reported raising the swivel seat can make the seating and driving uncomfortable for the Promaster 2500 especially tall people.
This read below said it all including instructions
FaroutRide Swivel Seat Review and Comparison
A key note in the article is restated here:
*ProMaster: the Scopema ships with two spacing bars. These must be installed to prevent interference with the seat belt buckle, but this bumps the added height up to 1.5". ProMaster swivel users have found a workaround to bring the added height down to 1.0"
ProMaster Scopema Modification.
Brought it at The Swivel Shop for $350 each.
We had to cut the metal brackets to work - pictures below
