What kind of spade connector is this?
There's generally only two important variables in spade connectors:


Blade (not socket) width (the thickness may vary as well, but it should be prescribed by whatever the width is), 
and if it's on a wire (versus a board), wire gauge it accepts.


Measure the blade width (I've only ever seen them specified in inch sizes, 0.187, 0.250...), and see if there's a good match on some parts catalogs (here's the Digi-Key category).  After that, pick the one that fits a wire gauge that will safely carry your current.