To keep you from having to read that thread just to get info on the engine guards I decided to post the information here since I might not have the information in that one.
There has been several engine guards reported as causing damage when the bike was dropped. I have not read of the Triumph bars causing damage like some of the aftermarket brands. Givi was one of the brands reported as causing damage to the engine cases and heads. Most of the aftermarket brands are using the same lower mounting locations as Triumph. I have a theory as to why the Triumph guards don't cause damage but can't prove my theory, I feel they apply a force at angles different than Triumph Guards which is causing the damage.
I did purchase the improved Givi guards, part number TN6401A. The "A" designation is the improve guards which mount to the engine mount locations instead of to the engine cases. What ever brand or style you decide on, in my opinion, be sure they do not mount to the engine. YMMV but that was why I went with the TN6401A guards. Plus they will give me more mounting locations for new horns , crash bar bags and highway pegs.