If you don't mind, I’ll add some photos of the shock absorber just in case the link goes dead.Replying to an old thread in case someone else is still searching for seat shocks. I found one that works well. It's a bit smaller diameter than the stock shock from my 1990 but fits just fine. Here's the link:
# Shock Absorber Kit for ISRI 6000/6500 Seats 31141-02.
# OA41 Seat suspension spring For ISRI 6000 seats.
# Toyota 90506-16065 Tension Spring.
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