You could #1 add sheet metal to bottom of the seat you get at lowes or home d po.. not covering the staples..take some of the upholstery staples loose enough to sneak bolts with large washers behind to support seat better or #2 remove the plastic completely and pop rivit the upholstery to metal plate in place of staples...#1 method i did to my mmb80 to raise on springs i did add a metal bar "backbone" to mine since i raised it for extra strenght..i weigh 185 lbs...guess you could use #2 method if you still have seats..cheers...
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