not sure which arms you're looking at there, as that link just goes to their homepage...
Basically, anything with spherical joints will allow the suspension to function properly without binding, especially in the upper arms. Rod-end type joints do wear out and get noisy in about 20,000 miles. Anything with a Johnny Joint (Currie) or similar (Edelbrock, UMI roto-joint, etc) will both provide the great performance AND long-lasting durability.
Polyurethane bushings really bind up the rear suspension, and should be avoided in the upper arms.
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Derek Kiefer, member of Minnesota's Northstar Chevelle Club
69 Malibu Pro-Touring - 69 SS396 3spd - 23 Model T roadster pickup
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