Ooooh. that's a full width card...and is roughly the same specs-wise as the AMD E9175, currently listed for the very unreasonable price of 400 dollars on evilBay. At that price and for the dimensions/power draw you can gun for the Inno3D GTX1050 slim (or 1650 single-slot) and get much more performance out of it.The only RX550 low profile and single slot wide card I found is the "Yeston RX550-4G D5 LP" which only has 512 shaders of Lexa GPU, the same amount as the amd E9173, but 2GB more memory.
It's really too bad that the tech for a half-width, half-height 1 slot card stopped with the GT1030 and went no place further. You figure some shady Chinese vendor would've flipped a bunch of Geforce GTX1050 Mobile GPUs into boards and made a killing for it on the SFF upgrader market by now.