I found it. An mitx sized AM3+ motherboard. : r/Amd
Mvix 780G-SP128M Mini-ITX Motherboard for Minx HTPC MM-780G B&H
Motherboard Am3 Mini Pc Support Adaptor Mini Atx Top45 T7100 - Buy Motherboard Am3 Mini Pc,4 Ethernet Ports Motherboard,Net2550 Fanless Motherboard Product on Alibaba.com
ZOTAC 880GITX-A-E AM3 Mini ITX AMD Motherboard - Newegg.com
Sapphire IPC-AM3DD785G Socket AM3 DDR3 Mini ITX Motherboard Review Result and general impression
JetWay JNC84E-LF AM3/AM2+/AM2 Mini ITX AMD Motherboard - Newegg.com
ASUS M4A88T-I Deluxe AM3 Mini ITX AMD Motherboard - Newegg.com
Motherboard Am3 Mini Pc Support Adaptor Mini Atx Top45 T7100 - Buy Motherboard Am3 Mini Pc,4 Ethernet Ports Motherboard,Net2550 Fanless Motherboard Product on Alibaba.com
Original Used Asus M4A88T I Deluxe Desktop Motherboard 880G Socket AM3 DDR3 USB2.0 Mini ITX 100% Fully Test|desktop motherboard|am3 ddr3socket am3 - AliExpress
Mini-itx Socket Am3 For Asus M4a88t-i Deluxe Original Used Desktop For Amd 880g Motherboard Ddr3 Usb2.0 Sata2 - Motherboards - AliExpress