SLI Bridge - What is the proper slot spacing

Question

I am getting ready to order and install a second EVGA GeForce GTX 960 for a two way SLI. My concern lies with an SLI Bridge. I have a Gigabyte Z170MX-Gaming 5 Motherboard and plan to have the Cards in the first and third slots. reference image below

My current card is in slot 1 and spans over slot 1 and slot 2. I know the second card I will be getting will be placed in slot 3 and cover slot 3 and 4.

Here is an image for reference

I ended up doing some research and found this page here: Official NVIDIA SLI Bridges

However, I can't really understand it :(

So my answer really boils down to, what is the slot spacing number I will need for this setup?

Solution

Since the cards are two-slot widths, they expect that you'd use slots 1 and 3, and the included SLI bridge should accommodate that. If you want to use a wider spacing, you can get longer SLI bridges from nVidia: