I have both poly and aluminum rack mounts on two separate cars.  I  
personally prefer the aluminum mounts as they have a good solid feel and 
because  I had 
an early set of poly mounts wear out relatively quickly in the past.   I 
have, however, had no problem with the current poly mounts installed two  years 
ago purchased at one of my local shops.  (I think they were from  TRF.)   
 
I have not hit a curb in nearly 25 years, and vigorously avoid potholes  
whenever possible, so the concerns some may have about the steering box  damage 
are not of particular concern to me.  I can see, and  would concede, that if 
you 
are not very careful about how you  drive this might be a valid concern.
 
Cheers!
 
Mark
 
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