2 GPS Setup

I am little confused about two GPS setup.

1. My main GPS is a "Here GNSS" with 8 pin connector which will go into GPS-1 Port.

2. Now the 2nd GPS port on Pixhawk 2 is 7 PIN connector!

Do I need a specialized GPS for the 2nd GPS? or I can order a "Here GNSS GPS" with a 7 pin connector? if yes from where?

Furthermore, are there any GPS extension cables available for "Here GNSS" GPS?. The standard length is not enough for my application.

Lastly, do I have to do anything special inside the Mission planner to enable both GPS.

Any gotchas, you guys know I can learn from.

Thanks for your help.

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