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The extended standoffs are 15mm long. See photos for full details showing the assembled item. I found it easiest to push the 40-pin connector into the PoE hat first, since it is quite a snug fit, then add the 4-pin extender and finally plug the PoE hat onto the Pi.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.