Ironic that you mentioned that. I was viewing sites today, regarding LPG / Natural Gas kits. Here is one you may wish to consider if you are stateside. (I'm assuming you are, due to the specific model number you mentioned.)
https://hutchmountain.com
I am considering the same LPG kit, primarily due to LPG being much cleaner burning and longer lasting quality, over petrol. Hutch Mountain offers a "Y" adapter. Their LPG kits keep the regulator off the generators, unlike so many other kits out there. I personally like that, and the quick disconnect you mount at the top of the generator.