I have a GSA with engine bars and then bought X-heads thinking that I could fit them under the bars as a "belt and braces" measure.
Well, they don't fit under the bars especially on one side ...can't recall which. I emailed NN (the supplier) who contacted Machine Art. Machine Art offered up a "fix" which is to use cylinder spacers/washers behind the bar mountings.
BMW then threw a huge wobbly saying that doing such would potentially make the performance of the bars unsafe and could affect any warranty on the bike as it had been changed from its design safety specification.
At that point, "no-one" could help. I sold them to a GS LC TE owner and they look great on his bike.
If you own a GSA and you've "adjusted" your crash bars to accommodate the X-heads, it might be worth checking any factory small print. The BWM dealer I dealt with was not that happy about them. And as I don't want to invalidate any warranties on a 6 month old GSA, I'd rather bash the heads than risk BMW walking away from any warranty issues.
Gosh...it's a minefield out there....
What part of the BMW warranty could possibly be affected by the fitting of the spacers?

Take a look again at post 8
I saw a TE spec GSA that had a broken nearside lower engine mount caused by the OE bars in a low speed spill
This was a dealer's demo bike that had been dropped in their car park. The bike was a stock TE spec GSA and the OE bars broke the engine mount. They also mashed the cam cover although not to the point of leaking
