Well I guess persistence pays off. After the second response from Dometic didn't answer my question. I finally got through on the support line. Walked them through everything including the response I got by email.
Conversation went like this.
Support: Correct you need the 8951002.400B standard hardware set.
Me: Every vendor and rv shop I checked with said the part number was 8952002.400B.
Support: Let me see, oh they're right the 8951002.400B part number is obsolete. The new part number with adjustable arms is 8952002.400B.
Found a new set for $300 shipped. Scheduled to arrive tomorrow.
