SLI bridge length

[kefan77]

So, I'm planning on SLIing 2x GTX670 Direct CU II on MSI Z77 G55, but just can't find what length SLI bridge I need.

There are 70mm, 80mm, 90mm and 120mm. Which one should I get?

I tried to find out what the spacing is between PCI-E slots, but didn't find the answer.

 

[setter]

The Bridge will have been supplied with the motherboard.

 

[kefan77]

yeah, just had a look in the box and it includes 100mm.