I received my engine guard today! I had checked out a lot of different models (see this list – in Spanish) but in the end the only one that I found convincing was the one manufactured in the USA by Adventure MotoStuff.
All the other options had some shortcomings – they were too narrow at the top and exposed part of the oil radiator; they requiered the oil radiator to be moved to a higher position; they had exposed screws at the bottom; they had access holes at the bottom (handy for servicing the bike, but leaves some parts more exposed); they were build of different parts screwed or welded together, some of them being too thin; etc.
The Adventure MotoStuff one is made of one thick, solid piece of metal, it covers the oil radiator, can be attached to the Hepco & Becker crash bars I already have and has a perfectly clean underside, withouth protruding bolts or screws. The mounting bracket also looks very sturdy.
It took about a week and a half to arrive, and my only complaint is that I had to pay import VAT, which had never happened before with anything else I had ordered online. I guess this time I was unlucky and the parcel was inspected at the border.
Customer service at Adventure MotoStuff was great, I emailed them some questions and they replied promptly with clear and useful answers.