Well from what I have heard about the poly cab mounts is they give a rougher ride, personally I would just use the rubber for cab, bed and Core support and use the poly for the suspension!
Charlie
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1968 C10 Truck LWB Fleetside
1968 C10 Truck SWB Stepside
1994 K2500 Ext Cab Fleetside
2008 Honda Civic Si *lease*
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