Try the trading forum for this.
Advice though, you want to marry someone with a PI, so what do you have to offer someone in return? What makes you someone good to marry? You need to remain married for 2000 days for all those merits, can you promise that kind of commitment? How do they know you won't just divorce when someone better comes along? How can you trust a stranger like that? That's not even getting into the PI vault access question.
If you want a long term commitment, you would be far better asking an unmarried member of your faction, or a friend. Someone you already know and can trust, not a random person you don't know can commit to 2000 days with you.
Edit:
Hellraisers disliked your post Downvoting advice won't help you get married either.