If you look at the Mountune rmm offered by Ford Performance and also look at the installation video on the Mountune website, the rmm has yellow polyurethane bushings. But the rmm on the Mountune website has black bushings, and the website description specifically states the color as being black. Does anyone know what changed, besides the color? Is the new black bushing mount stiffer or softer than the old yellow one, or is a durability issue with the yellow bushings? Something else?