Manufacturers typically do not sell directly to the customer, with a few exceptions.... I have found that when buying, if you can get the manufacturers representitive involved, the process is much better...
We have had the rep involved in our last 3 with wheel purchase's , and was able to get a lot of extras.....
Back in "07" we wee looking at a KZ and ran into their East Coast Rep... She helped us get a great deal, and also we were able to switch out some windows for larger, sliders... The dealers will usually just say thats not an option.