MANO540: a Mini ITX board with full height PCIe x16 slot
Mini Pcie Pcie 1 To 3 Pci Slot Riser Card Mini Itx To External 3 Pci-e Slot Adapter Pcie Port Multiplier Card For Motherboard - Pc Hardware Cables & Adapters - AliExpress
Whiskey Lake thin Mini-ITX board has PCIe golden finger
Mini-ITX|Industrial Motherboards|DFI
Amazon.com: CUK ASRock H670M-ITX/ax Mini ITX Motherboard for 12th Gen Intel LGA 1700 CPUs at 125W PL1 with PCIe 5.0 x16 Graphics : Electronics
Thin Mini-ITX SBC brews Coffee Lake with triple HDMI and PCIe x16