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Message: <blockquote data-quote="mars2878" data-source="post: 28666" data-attributes="member: 12483">I have a Vin # for a 2025 Yukon at4 Ultimate 6.2L with the R4L rims & 4-piston calipers as I currently can not find a Vin for one the 6-piston setup. On GM's site, I select the 6-piston upgrade part package. It then asks for the Vin #, so I enter it. It then says that it's not compatible.The whole point of this thread was to figure out what options are needed on a 2025 Yukon at4 Ultimate with R4L rims to compatible with the 6-piston brake upgrade.If I go to the GMC site, I can build out both a 2025 & a 2026 Yukon at4 Ultimate with R4L rims with either the Turbo Diesel or the 6.2L it let's me option it with the 6-piston upgrade. Everything else is standard equipment including the no-charge White paint. It then tells me that none are currently for sale & wants me to proceed to order to have it built.</blockquote>