That price is pretty outrageous, but it illustrates a suspension system, brakes, and final drive that somebody else has already done the engineering on to make it work well. I've got the same basic setup that I acquired for a lot better price- - - - -free! I'll just modify the rear frame area of the Excalibur that was also gifted to me to make the rear section fit. The front will be a M-II setup that I purchased for $200.00.
Jerry