Thanks im getting a set too guess I will use the poly.

 

I stay with the stock. IMO, going with the stiffer will increase vibs. But I can be wrong. I was tested for carpal tunnel almost 20 yrs. ago. I've just learned to live with it. It was really bad when I was into the ATVs.

 

Still wondering why the OP "needs to get something stiffer". I've got nearly 40k on the stock ones and I've got no slop at all. I get that they're a wear item and that the poly bushings should last longer, but stiffer is going to transmit more vibrations.

 

Stock will do you just fine on stock height bars for a long time, but if you put on taller bars rubber bushings will wear down faster, also an issue in environments where your temperatures fluctuate from in the 100s over summer to negative temps in the winters with shrinkage and drying out. If the bikes stored outdoors or under a cover/tarp you'll have more temp exposure

 

How tall are the bars.

The rubber mounts go south fast, the Polys can be an improvement for standard and mid rise bars, , but if ape hanger bars, still a lot of movement with the poly mounts that may still required either solid, or add in spacers to get more nut compression on the poly mounts..