Power running board bracket swap?

[CyberCode26]

Hello all! I have a question on the Yukon power running board brackets. The OEM brackets (the non-motorized ones) on the left rear and right rear on my 13 Yukon are seized pretty badly. Considered rebuilding the bushings until I saw one of the brackets are starting to crack. Buying new is outrageous (22778159 and 20784795), they run over $300 each. I found aftermarket powered brackets (for the front motorized pieces), but I am not having any luck finding a cheaper alternative. I found that the 15-19 rear brackets are slightly different. Has anyone tried to retrofit the newer brackets onto an older Yukon? (Part number 22935838 for Right Rear 15-19).
Thanks for any information!