Search this forum for threads related to "swimming pool noodles". I'm not sure if it's in diesel discussion or general Tech discussion. People stuff these between the springs as a cheap way to "rebuild" the seats.

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1987 Mercedes 300D ~200K (Greasecar & Biodiesel)
1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel)
1996 Thomas/International Bus with DT466 engine