LS400 Seats
Lead Lap
Joined: Jan 2007
Posts: 683
Likes: 3
From: UK
I think the 92-94 seats are a straight swop and possibly the 94-97 but these may have the side airbags,there have been reports of the 97 on series IV seats also being fitted but major modifications are required to do so.
Lead Lap
Joined: Jan 2004
Posts: 3,595
Likes: 271
From: Kansas
I don't think it is that simple. Significant changes were made to the LS400 front seats for 1993 including lumbar support and vertical adjustments for the front passenger seat. I don't think the 90-92 front passenger seat wiring harness can support a 93-94 seat. If your 91 has the memory feature, it may not be able to control the 93-94 driver seat although maybe it can be done with modifications. You are safe getting 90-92 seats although you should confirm whether you can use a non-memory seat with a memory harness/ECU and vice versa if the 90-92 seats you buy are of the opposite type.
I like the 95-97 rear seats because it has cup holders 
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