[daxtrader]

Hi all, I need some help please. I need a replacement power supply for my mbox pro.

After hitting forums, looking up the mbox3 tech spec, finding as much as I could I understood that I needed a
"9V, 4A, 36W, Plug-In Power Supply (Center Positive 2.1mm x 5.5mm plug)"

They are not easy to find.
But I found one!!
After ordering it, I received it this morning.

But it doesn't even fit!

So which part did I get wrong?
The plug is definitely the correct spec based on the above.

Thanks