The best replacement for bucket seat is bench seat.

The best alternatives to bucket seat are rated as following:
★★★★★  bench seat
★★★  captains chair
★★  sport seat
★  high back
  captain seat

Your alternative for bucket seat is not listed? Suggest!
Speaking about bucket seat, one probably shouldn't forget about harness.

Other search terms related to bucket seat and their ratings are:
★★★★★ harness
You have in mind a companion for bucket seat and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of bucket seat in all years. Click on graph for more.
bucket seat
bench seat
captains chair