i have the chrome dlp swingarm also and have seen the other one but didnt see any reinforcement. all i saw was a huge notch cut into a factory swingarm that has already had documented cases of failure. something else you may not know is that when the 300 wears out its not just an easy replace the tire. the whole swingarm has to be pulled to get the tire out to change it. pm swatcop and see what he tells you its costing him to get a new tire. according to the dealer book, shop time to pull the swingarm is 4 hours at app. $80/hr (depending on your shop) plus the cost of the tire and labor to mount it. looking at over $600 just to replace the 300 when it wears out.