“This was the only 4 pin PoE extender available on the web. Luckily, they fit my heatsink and PoE HAT very well. Bought 20 of them for future use just in case they get out of stock.”
“Does what it says. When fitted to a Pi 4B in the Aluminium Armour heatsink/case, you can slip a shim over the pins, and even a hat on top. The stack looks a bit Heath Robinson, but it all fits. You need to put some insulating tape around the shim or hat to protect against shorting to the case.”