Judging from what you say she's into it too. First thing you have to do is repeat to her (many times) that you 're serious about it and you want to watch her with a black man. Assure her you will still love her no matter if she enjoys it and wants to do it again or she will stop after the first time. Remind her you can live your fantasies now your kids are gone and that you have many years ahead to enjoy life.
Continue bringing the idea when she's hot and you are having sex. Would be good to show her amateur interracial clips when you are in bed. Choose clips with wives who look like her and they are in the same age group. It's important she realizes it's not a fantasy exists only in porn but many couples practice and enjoy the lifestyle.
Start a thread in various forums like this stating where you live and what you are looking for. Be specific about what you want and what you don't want. You will definitely find more than one man who is interested. Meet him first to be sure he is serious, some men are fake and they do not show up. Arrange a second meeting with your wife present. You can go in a quiet bar at night to talk or in a cafe/restaurant any time of the day. Let her decide if she likes the man, if she wants to go further on the first date or she wants more dates. If you are both serious about it you will find the suitable man for her.
Good luck...
