Question Motherboard IO on the wrong side?

[Elodin77]

So my case is a Deepcool Tesseract that is supposed to compatible with ATX, Micro-ATX and Mini-ATX.
I recently bought a second hand motherboard called a "HP Compaq Pro 6000 Motherboard LGA 775 8000 531965-001 503362-001". I didn't realise but it was labelled SFF (Small form factor) which I assumed was another term for micro ATX.
But now it doesn't fit and the IO is on the wrong side. So will I have to buy another motherboard that is ATX instead of SFF.

 

[hotaru.hino]

The HP computer used a formfactor called BTX.