The new (used) ones look good I didn't do anything to treat them since I am in Colorado now and don't see it being a problem anymore. if in the future we move to a salt state or anywhere near the ocean I will probably re look at it. It would be difficult to treat a used set effectively though. If I got a new set I would blow a can of under coating into them or something similar. I really went over everything on the undercarriage and every other component and all the unibody looks awesome these were the only exception. FWIW I found the used set locally on Car-part dot com for $35 each arm.

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2005 KJ CRD bought used with 155K miles
EHM,ORM
1932 Ford Pickup, Channelled, Z'd East coast style, 303 olds, 3spd OD
1968 Buick skylark Conv Frame stubbed with MII and air bags

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TWO Identical 2005 Liberty Sport CRDS
#1 CRD, 174,000 miles. Eco tune, Samco hoses. Mobil1 0-40w used since day one
#2 CRD 143,000 miles. Bought used (unknown history) with 100,000 miles. Samco hoses.
Eco tune, new rockers, and 5 volt glow plugs installed at 124,000 miles

Oh, just create the link.
http://www.car-part.com

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Aaron

A vehicle isn't yours till you learn to wrench on it yourself.

2002 Jeep Liberty Sport (Eugene, I am the Passenger, And I ride and I ride.)
1999 Chev Astro 2WD (Green, Daily Driver)
1997 Chev Astro AWD (Grumpy "The Heep", $250 Rally Van, 335k miles, 2" lift, 31" tires)