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Have been using the original 6" Griots Garage 3rd Gen polisher for several years and am looking to upgrade. Looking at the Rupes but can't decide between the 15 or 21?

Any suggestions? Mostly have Lake Country 5.5" pads.

Also, anybody know the difference between the Mark III and the LHR ES models?
 

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15mm if you plan to use the 5" backing plate. 21mm if you are working more on larger vehicles with more flat surface area but it comes with the larger backing plate. You can put a 5" backing plate on the 21mm as well but most seem to prefer the 15mm for 5" backing plate work on tighter curvy surfaces. Get the Mark III...
 
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