https://hothardware.com/news/noctua-am5-mounting-bars-ryzen-cpus-drop-temps
The mounting bars shift the position of the heatsink so that the most pressure is applied to the hottest part of the CPU.
mounting barsnoctuaryzencpuspromise
https://www.noctua.at/en/support/faqs/why-are-the-offset-am5-mounting-bars-subject-to-service-charges-while-other-mounting-kits-are-free-of-charge
Noctua has been offering mounting upgrade-kits for various platforms free-of-charge since 2006 and remains committed to providing compatibility upgrade-kits...
mounting barsfaqoffsetpaid