Just got back from my parts supplier A and A auto parts. They think the correct Dorman part is 935-403 , I'll have them on Wednesday. Upon looking more carefully at the front flex disc it is indeed cracked, so my first assessment was wrong. Ill advise when I compare them. Here is a picture of the flex disc showing the protruded bushings. Three on one side and three offset on the other side. These protrusions fit into the yokes which are machined to accept them. I hope my running around provides some clarity to others. SRT and Auto trans models may be different. Stay tuned.

note three bushings protrude on this side by 3mm. the opposite side has the alternative 3 protruding.

MB part number. Front and rear on my '04 XF manual transmission, are the same. You can see how alternate bushings protrude.