Electronic – this 8 pin PCB to wire connector

There's generally only two important variables in spade connectors:

1. Blade (not socket) width (the thickness may vary as well, but it should be prescribed by whatever the width is),
2. 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.

Without precise measurements it's a little hard to tell, but I am pretty sure that its a JST XH series connector. A datasheet for these connectors can be found here.

The OP has since tested and confirmed this to be the correct part.