Feedback Seats by Tillett
#23
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The B5 has 23mm (lotus) mounting points which will require some specific brackets not typical to Nagisa, Buddy Club, etc.
#25
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If your mounts have either 23 or 29cm mounting then it is a simple matter of price vs weight.
#27
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For the B5, you will have to get the Tillett brackets & sliders and mount them on a base like mounting systems like the Sparco Base.
OEM mounts integrate with the stock seats.
#30
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Choices really depend on budget and your mounting options. B5 need some work to mount as they use Lotus 23cm width mounting points. B1s use the standard 29cm mounting points and weigh half as much.