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The fiber glass low back seats?
If yes, the seat base has a metal plate bonded in.
1) Figure out where you want the 4 bolt holes to be in the base. Make sure a 1/8" drill bit chucked long in a drill will drill from the bottom into and through the inner shell. You can use a larger guide hole but no larger then your hole saw guide bit.
2) Drill a small guide hole through the base up in through the inner shell. The guide hole is used to hole saw a hole in the inner shell to insert the bolt and washer into lower base plate.
3) Drill base plate hole to size of bolt.
4) Use some tape to lightly hold bolt and washer to socket and insert into set and bolt into place.
If yes, the seat base has a metal plate bonded in.
1) Figure out where you want the 4 bolt holes to be in the base. Make sure a 1/8" drill bit chucked long in a drill will drill from the bottom into and through the inner shell. You can use a larger guide hole but no larger then your hole saw guide bit.
2) Drill a small guide hole through the base up in through the inner shell. The guide hole is used to hole saw a hole in the inner shell to insert the bolt and washer into lower base plate.
3) Drill base plate hole to size of bolt.
4) Use some tape to lightly hold bolt and washer to socket and insert into set and bolt into place.
