to my understanding the spacer is only for the gear diff as the diff is wider its too wide for the delrin, so he just makes a G10 spacer instead of trying to get thicker plastic. Chad now know what he needed to change to make it fit the CR2 and now they are differant then the regular version. Contact him and he may be able to swap them for you so it would just be bolt in. The other solution would to just buy his chassis conversion
