[bestgenman]

Bob, Unfortunately I cannot give you a part number but found the springs in the Firestone catalog just as Steve Bare recommended for my 89 Newell.  I've found 15 years as a decent replacement time frame.  It had been 15 years on the 89 and the current coach needed them at 15 years also.   I found the best diagnosis is to spray them with a soap solution and if they are leaking it will look as if you applied shaving cream!!.  Replace those.